Check empty and digit input with regex at same time in MVC












2















First I want to check that if input is null than show error and if input has digit value than also show an error.... So what's pattern for this? I hope that you understand my questions Thanks!



[RegularExpression(@"^[D]$", ErrorMessage = "Input Cannot be empty and must have Alphabets only")]



public string FirstName { get; set; }





asp.net regex







share|improve this question




















  • 1





    What is environment you are working in? programming language, web framework?

    – Fabio
    Nov 19 '18 at 23:22






  • 1





    Regexps cannot detect null values. They only work with strings. You might have meant empty string.

    – Wiktor Stribiżew
    Nov 19 '18 at 23:25













  • @NRitH I already removed that tag

    – Nick
    Nov 20 '18 at 2:55











  • @WiktorStribiżew yeah i means that first check input is empty and second check the input has number?

    – Asif Shakir
    Nov 20 '18 at 7:15











  • @Fabio please check i have edit the code for more clear understanding .

    – Asif Shakir
    Nov 20 '18 at 7:24
















2















First I want to check that if input is null than show error and if input has digit value than also show an error.... So what's pattern for this? I hope that you understand my questions Thanks!



[RegularExpression(@"^[D]$", ErrorMessage = "Input Cannot be empty and must have Alphabets only")]



public string FirstName { get; set; }





asp.net regex







share|improve this question




















  • 1





    What is environment you are working in? programming language, web framework?

    – Fabio
    Nov 19 '18 at 23:22






  • 1





    Regexps cannot detect null values. They only work with strings. You might have meant empty string.

    – Wiktor Stribiżew
    Nov 19 '18 at 23:25













  • @NRitH I already removed that tag

    – Nick
    Nov 20 '18 at 2:55











  • @WiktorStribiżew yeah i means that first check input is empty and second check the input has number?

    – Asif Shakir
    Nov 20 '18 at 7:15











  • @Fabio please check i have edit the code for more clear understanding .

    – Asif Shakir
    Nov 20 '18 at 7:24














2












2








2








First I want to check that if input is null than show error and if input has digit value than also show an error.... So what's pattern for this? I hope that you understand my questions Thanks!



[RegularExpression(@"^[D]$", ErrorMessage = "Input Cannot be empty and must have Alphabets only")]



public string FirstName { get; set; }





asp.net regex







share|improve this question
















First I want to check that if input is null than show error and if input has digit value than also show an error.... So what's pattern for this? I hope that you understand my questions Thanks!



[RegularExpression(@"^[D]$", ErrorMessage = "Input Cannot be empty and must have Alphabets only")]



public string FirstName { get; set; }





asp.net regex




asp.net regex






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 20 '18 at 7:54









Foo

1




1










asked Nov 19 '18 at 23:20









Asif ShakirAsif Shakir

239




239








  • 1





    What is environment you are working in? programming language, web framework?

    – Fabio
    Nov 19 '18 at 23:22






  • 1





    Regexps cannot detect null values. They only work with strings. You might have meant empty string.

    – Wiktor Stribiżew
    Nov 19 '18 at 23:25













  • @NRitH I already removed that tag

    – Nick
    Nov 20 '18 at 2:55











  • @WiktorStribiżew yeah i means that first check input is empty and second check the input has number?

    – Asif Shakir
    Nov 20 '18 at 7:15











  • @Fabio please check i have edit the code for more clear understanding .

    – Asif Shakir
    Nov 20 '18 at 7:24














  • 1





    What is environment you are working in? programming language, web framework?

    – Fabio
    Nov 19 '18 at 23:22






  • 1





    Regexps cannot detect null values. They only work with strings. You might have meant empty string.

    – Wiktor Stribiżew
    Nov 19 '18 at 23:25













  • @NRitH I already removed that tag

    – Nick
    Nov 20 '18 at 2:55











  • @WiktorStribiżew yeah i means that first check input is empty and second check the input has number?

    – Asif Shakir
    Nov 20 '18 at 7:15











  • @Fabio please check i have edit the code for more clear understanding .

    – Asif Shakir
    Nov 20 '18 at 7:24








1




1





What is environment you are working in? programming language, web framework?

– Fabio
Nov 19 '18 at 23:22





What is environment you are working in? programming language, web framework?

– Fabio
Nov 19 '18 at 23:22




1




1





Regexps cannot detect null values. They only work with strings. You might have meant empty string.

– Wiktor Stribiżew
Nov 19 '18 at 23:25







Regexps cannot detect null values. They only work with strings. You might have meant empty string.

– Wiktor Stribiżew
Nov 19 '18 at 23:25















@NRitH I already removed that tag

– Nick
Nov 20 '18 at 2:55





@NRitH I already removed that tag

– Nick
Nov 20 '18 at 2:55













@WiktorStribiżew yeah i means that first check input is empty and second check the input has number?

– Asif Shakir
Nov 20 '18 at 7:15





@WiktorStribiżew yeah i means that first check input is empty and second check the input has number?

– Asif Shakir
Nov 20 '18 at 7:15













@Fabio please check i have edit the code for more clear understanding .

– Asif Shakir
Nov 20 '18 at 7:24





@Fabio please check i have edit the code for more clear understanding .

– Asif Shakir
Nov 20 '18 at 7:24












3 Answers
3






active

oldest

votes


















1














^d*$ will match any input value that is either empty or composed solely of digits. Alternatively D will match any input value that has at least one character that is not a digit. For example, in Javascript:






console.log(/^d*$/.test(''));

console.log(/^d*$/.test('123'));

console.log(/^d*$/.test('x1'));

console.log(/D/.test(''));

console.log(/D/.test('123'));

console.log(/D/.test('x1'));








share|improve this answer































    1














    Your solution does not work for you because the ^[D]$ pattern matches a string that only contains a single char other than a digit. Note that [ and ] can be safely removed as character classes only make sense when they have multiple chars/char ranges in them.



    I suggest



    [RegularExpression(@"^D+$", ErrorMessage = "Input can have no digits.")]
    
public string FirstName { get; set; }


    The @"^D+$" pattern only matches a string that has no digits in it. Note that RegularExpressionAttribute patterns should always match the whole input, so ^ and $ anchors are good to use here.






    share|improve this answer


























    • Your pattern does not work - I think it works but in another way: Match with this pattern

      – Foo
      Nov 20 '18 at 7:52











    • @TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.

      – Wiktor Stribiżew
      Nov 20 '18 at 7:52













    • @WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?

      – Asif Shakir
      Nov 20 '18 at 7:57











    • @AsifShakir If you need to show error if the input is empty, use [Required]. There is no reason for you to want to avoid it.

      – Wiktor Stribiżew
      Nov 20 '18 at 7:58













    • @WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?

      – Asif Shakir
      Nov 20 '18 at 8:00



















    1














    [Required(ErrorMessage = "{0} cannot be empty")]
    
[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} must have Alphabets only")]
    
[Display(Name = "First name")]
    
public string FirstName { get; set; }


    Error message if the input is empty:




    First name cannot be empty




    and if the input value contains non alphabet character(s):




    First name must have Alphabets only





    If you want to allow empty value, you could try:



    [RegularExpression(@"(^$)|(^[a-zA-Z]+$)", ErrorMessage = "{0} must have Alphabets only")]


    (^$) allow an empty string. Then, if it's NOT empty, continue to check with the pattern (^[a-zA-Z]+$) (alphabet characters only).






    share|improve this answer
























    • Without using [Required] how i dont Allow empty string with Regex pattern.

      – Asif Shakir
      Nov 20 '18 at 8:44











    • @AsifShakir In that case, you just need [RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message: First name is not valid.

      – Foo
      Nov 20 '18 at 8:47











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    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    1














    ^d*$ will match any input value that is either empty or composed solely of digits. Alternatively D will match any input value that has at least one character that is not a digit. For example, in Javascript:






    console.log(/^d*$/.test(''));
    
console.log(/^d*$/.test('123'));
    
console.log(/^d*$/.test('x1'));
    
console.log(/D/.test(''));
    
console.log(/D/.test('123'));
    
console.log(/D/.test('x1'));








    share|improve this answer




























      1














      ^d*$ will match any input value that is either empty or composed solely of digits. Alternatively D will match any input value that has at least one character that is not a digit. For example, in Javascript:






      console.log(/^d*$/.test(''));
      
console.log(/^d*$/.test('123'));
      
console.log(/^d*$/.test('x1'));
      
console.log(/D/.test(''));
      
console.log(/D/.test('123'));
      
console.log(/D/.test('x1'));








      share|improve this answer


























        1












        1








        1







        ^d*$ will match any input value that is either empty or composed solely of digits. Alternatively D will match any input value that has at least one character that is not a digit. For example, in Javascript:






        console.log(/^d*$/.test(''));
        
console.log(/^d*$/.test('123'));
        
console.log(/^d*$/.test('x1'));
        
console.log(/D/.test(''));
        
console.log(/D/.test('123'));
        
console.log(/D/.test('x1'));








        share|improve this answer













        ^d*$ will match any input value that is either empty or composed solely of digits. Alternatively D will match any input value that has at least one character that is not a digit. For example, in Javascript:






        console.log(/^d*$/.test(''));
        
console.log(/^d*$/.test('123'));
        
console.log(/^d*$/.test('x1'));
        
console.log(/D/.test(''));
        
console.log(/D/.test('123'));
        
console.log(/D/.test('x1'));








        console.log(/^d*$/.test(''));
        
console.log(/^d*$/.test('123'));
        
console.log(/^d*$/.test('x1'));
        
console.log(/D/.test(''));
        
console.log(/D/.test('123'));
        
console.log(/D/.test('x1'));





        console.log(/^d*$/.test(''));
        
console.log(/^d*$/.test('123'));
        
console.log(/^d*$/.test('x1'));
        
console.log(/D/.test(''));
        
console.log(/D/.test('123'));
        
console.log(/D/.test('x1'));






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 20 '18 at 2:54









        NickNick

        27.9k121941




        27.9k121941

























            1














            Your solution does not work for you because the ^[D]$ pattern matches a string that only contains a single char other than a digit. Note that [ and ] can be safely removed as character classes only make sense when they have multiple chars/char ranges in them.



            I suggest



            [RegularExpression(@"^D+$", ErrorMessage = "Input can have no digits.")]
            
public string FirstName { get; set; }


            The @"^D+$" pattern only matches a string that has no digits in it. Note that RegularExpressionAttribute patterns should always match the whole input, so ^ and $ anchors are good to use here.






            share|improve this answer


























            • Your pattern does not work - I think it works but in another way: Match with this pattern

              – Foo
              Nov 20 '18 at 7:52











            • @TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.

              – Wiktor Stribiżew
              Nov 20 '18 at 7:52













            • @WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?

              – Asif Shakir
              Nov 20 '18 at 7:57











            • @AsifShakir If you need to show error if the input is empty, use [Required]. There is no reason for you to want to avoid it.

              – Wiktor Stribiżew
              Nov 20 '18 at 7:58













            • @WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?

              – Asif Shakir
              Nov 20 '18 at 8:00
















            1














            Your solution does not work for you because the ^[D]$ pattern matches a string that only contains a single char other than a digit. Note that [ and ] can be safely removed as character classes only make sense when they have multiple chars/char ranges in them.



            I suggest



            [RegularExpression(@"^D+$", ErrorMessage = "Input can have no digits.")]
            
public string FirstName { get; set; }


            The @"^D+$" pattern only matches a string that has no digits in it. Note that RegularExpressionAttribute patterns should always match the whole input, so ^ and $ anchors are good to use here.






            share|improve this answer


























            • Your pattern does not work - I think it works but in another way: Match with this pattern

              – Foo
              Nov 20 '18 at 7:52











            • @TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.

              – Wiktor Stribiżew
              Nov 20 '18 at 7:52













            • @WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?

              – Asif Shakir
              Nov 20 '18 at 7:57











            • @AsifShakir If you need to show error if the input is empty, use [Required]. There is no reason for you to want to avoid it.

              – Wiktor Stribiżew
              Nov 20 '18 at 7:58













            • @WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?

              – Asif Shakir
              Nov 20 '18 at 8:00














            1












            1








            1







            Your solution does not work for you because the ^[D]$ pattern matches a string that only contains a single char other than a digit. Note that [ and ] can be safely removed as character classes only make sense when they have multiple chars/char ranges in them.



            I suggest



            [RegularExpression(@"^D+$", ErrorMessage = "Input can have no digits.")]
            
public string FirstName { get; set; }


            The @"^D+$" pattern only matches a string that has no digits in it. Note that RegularExpressionAttribute patterns should always match the whole input, so ^ and $ anchors are good to use here.






            share|improve this answer















            Your solution does not work for you because the ^[D]$ pattern matches a string that only contains a single char other than a digit. Note that [ and ] can be safely removed as character classes only make sense when they have multiple chars/char ranges in them.



            I suggest



            [RegularExpression(@"^D+$", ErrorMessage = "Input can have no digits.")]
            
public string FirstName { get; set; }


            The @"^D+$" pattern only matches a string that has no digits in it. Note that RegularExpressionAttribute patterns should always match the whole input, so ^ and $ anchors are good to use here.







            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Nov 20 '18 at 7:52

























            answered Nov 20 '18 at 7:47









            Wiktor StribiżewWiktor Stribiżew

            313k16133210




            313k16133210













            • Your pattern does not work - I think it works but in another way: Match with this pattern

              – Foo
              Nov 20 '18 at 7:52











            • @TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.

              – Wiktor Stribiżew
              Nov 20 '18 at 7:52













            • @WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?

              – Asif Shakir
              Nov 20 '18 at 7:57











            • @AsifShakir If you need to show error if the input is empty, use [Required]. There is no reason for you to want to avoid it.

              – Wiktor Stribiżew
              Nov 20 '18 at 7:58













            • @WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?

              – Asif Shakir
              Nov 20 '18 at 8:00



















            • Your pattern does not work - I think it works but in another way: Match with this pattern

              – Foo
              Nov 20 '18 at 7:52











            • @TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.

              – Wiktor Stribiżew
              Nov 20 '18 at 7:52













            • @WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?

              – Asif Shakir
              Nov 20 '18 at 7:57











            • @AsifShakir If you need to show error if the input is empty, use [Required]. There is no reason for you to want to avoid it.

              – Wiktor Stribiżew
              Nov 20 '18 at 7:58













            • @WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?

              – Asif Shakir
              Nov 20 '18 at 8:00

















            Your pattern does not work - I think it works but in another way: Match with this pattern

            – Foo
            Nov 20 '18 at 7:52





            Your pattern does not work - I think it works but in another way: Match with this pattern

            – Foo
            Nov 20 '18 at 7:52













            @TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.

            – Wiktor Stribiżew
            Nov 20 '18 at 7:52







            @TânNguyễn In answers, "does not work" means "does not work for OP". Edited the wording in answer.

            – Wiktor Stribiżew
            Nov 20 '18 at 7:52















            @WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?

            – Asif Shakir
            Nov 20 '18 at 7:57





            @WiktorStribiżew i understand it and used this pattern that's only wotk for digit checking but not working for empty input. how to check empty string with changing in this pattern?

            – Asif Shakir
            Nov 20 '18 at 7:57













            @AsifShakir If you need to show error if the input is empty, use [Required]. There is no reason for you to want to avoid it.

            – Wiktor Stribiżew
            Nov 20 '18 at 7:58







            @AsifShakir If you need to show error if the input is empty, use [Required]. There is no reason for you to want to avoid it.

            – Wiktor Stribiżew
            Nov 20 '18 at 7:58















            @WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?

            – Asif Shakir
            Nov 20 '18 at 8:00





            @WiktorStribiżew yeah you are right . But any possible way to check empty string with this pattern ?

            – Asif Shakir
            Nov 20 '18 at 8:00











            1














            [Required(ErrorMessage = "{0} cannot be empty")]
            
[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} must have Alphabets only")]
            
[Display(Name = "First name")]
            
public string FirstName { get; set; }


            Error message if the input is empty:




            First name cannot be empty




            and if the input value contains non alphabet character(s):




            First name must have Alphabets only





            If you want to allow empty value, you could try:



            [RegularExpression(@"(^$)|(^[a-zA-Z]+$)", ErrorMessage = "{0} must have Alphabets only")]


            (^$) allow an empty string. Then, if it's NOT empty, continue to check with the pattern (^[a-zA-Z]+$) (alphabet characters only).






            share|improve this answer
























            • Without using [Required] how i dont Allow empty string with Regex pattern.

              – Asif Shakir
              Nov 20 '18 at 8:44











            • @AsifShakir In that case, you just need [RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message: First name is not valid.

              – Foo
              Nov 20 '18 at 8:47
















            1














            [Required(ErrorMessage = "{0} cannot be empty")]
            
[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} must have Alphabets only")]
            
[Display(Name = "First name")]
            
public string FirstName { get; set; }


            Error message if the input is empty:




            First name cannot be empty




            and if the input value contains non alphabet character(s):




            First name must have Alphabets only





            If you want to allow empty value, you could try:



            [RegularExpression(@"(^$)|(^[a-zA-Z]+$)", ErrorMessage = "{0} must have Alphabets only")]


            (^$) allow an empty string. Then, if it's NOT empty, continue to check with the pattern (^[a-zA-Z]+$) (alphabet characters only).






            share|improve this answer
























            • Without using [Required] how i dont Allow empty string with Regex pattern.

              – Asif Shakir
              Nov 20 '18 at 8:44











            • @AsifShakir In that case, you just need [RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message: First name is not valid.

              – Foo
              Nov 20 '18 at 8:47














            1












            1








            1







            [Required(ErrorMessage = "{0} cannot be empty")]
            
[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} must have Alphabets only")]
            
[Display(Name = "First name")]
            
public string FirstName { get; set; }


            Error message if the input is empty:




            First name cannot be empty




            and if the input value contains non alphabet character(s):




            First name must have Alphabets only





            If you want to allow empty value, you could try:



            [RegularExpression(@"(^$)|(^[a-zA-Z]+$)", ErrorMessage = "{0} must have Alphabets only")]


            (^$) allow an empty string. Then, if it's NOT empty, continue to check with the pattern (^[a-zA-Z]+$) (alphabet characters only).






            share|improve this answer













            [Required(ErrorMessage = "{0} cannot be empty")]
            
[RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} must have Alphabets only")]
            
[Display(Name = "First name")]
            
public string FirstName { get; set; }


            Error message if the input is empty:




            First name cannot be empty




            and if the input value contains non alphabet character(s):




            First name must have Alphabets only





            If you want to allow empty value, you could try:



            [RegularExpression(@"(^$)|(^[a-zA-Z]+$)", ErrorMessage = "{0} must have Alphabets only")]


            (^$) allow an empty string. Then, if it's NOT empty, continue to check with the pattern (^[a-zA-Z]+$) (alphabet characters only).







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered Nov 20 '18 at 8:00









            FooFoo

            1




            1













            • Without using [Required] how i dont Allow empty string with Regex pattern.

              – Asif Shakir
              Nov 20 '18 at 8:44











            • @AsifShakir In that case, you just need [RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message: First name is not valid.

              – Foo
              Nov 20 '18 at 8:47



















            • Without using [Required] how i dont Allow empty string with Regex pattern.

              – Asif Shakir
              Nov 20 '18 at 8:44











            • @AsifShakir In that case, you just need [RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message: First name is not valid.

              – Foo
              Nov 20 '18 at 8:47

















            Without using [Required] how i dont Allow empty string with Regex pattern.

            – Asif Shakir
            Nov 20 '18 at 8:44





            Without using [Required] how i dont Allow empty string with Regex pattern.

            – Asif Shakir
            Nov 20 '18 at 8:44













            @AsifShakir In that case, you just need [RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message: First name is not valid.

            – Foo
            Nov 20 '18 at 8:47





            @AsifShakir In that case, you just need [RegularExpression(@"^[a-zA-Z]+$", ErrorMessage = "{0} is not valid.")]. This is not allowed an empty string and non alphabet characters with the error message: First name is not valid.

            – Foo
            Nov 20 '18 at 8:47


















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