how to solve the error of `unknown escape sequence (and 2 more errors)`
-1
I m trying to validate the image url using golang code but there is error in regular expression I'm showing my regular expression in this question:-
var validation = regexp.MustCompile("(http(s?):)|([/|.|w|s])*.(?:jpg|gif|png)")
Error:-
unknown escape sequence (and 2 more errors)
play link
go asked Nov 17 '18 at 9:45
stack
105
|
show 1 more comment
-1
I m trying to validate the image url using golang code but there is error in regular expression I'm showing my regular expression in this question:-
var validation = regexp.MustCompile("(http(s?):)|([/|.|w|s])*.(?:jpg|gif|png)")
Error:-
unknown escape sequence (and 2 more errors)
play link
go asked Nov 17 '18 at 9:45
stack
105
I'd suggest using backtics when defining regex so that you won't have to escape ""
– ssemilla
Nov 17 '18 at 9:51
@ssemilla can you tell me what corrections
– stack
Nov 17 '18 at 9:52
Replace " with `. I didn't actually review your regex but people usually make mistakes when they mean "\" rather than "". Using backtics instead makes it very clear what we mean since nothing is escaped.
– ssemilla
Nov 17 '18 at 9:52
@ssemilla By using ` instead of " it runs but not working properly it prints nothing
– stack
Nov 17 '18 at 9:55
Why are you using!validation.MatchString()instead of justvalidation.MatchString()?
– ssemilla
Nov 17 '18 at 9:58
|
show 1 more comment
-1
-1
-1
I m trying to validate the image url using golang code but there is error in regular expression I'm showing my regular expression in this question:-
var validation = regexp.MustCompile("(http(s?):)|([/|.|w|s])*.(?:jpg|gif|png)")
Error:-
unknown escape sequence (and 2 more errors)
play link
go asked Nov 17 '18 at 9:45
stack
105
I m trying to validate the image url using golang code but there is error in regular expression I'm showing my regular expression in this question:-
var validation = regexp.MustCompile("(http(s?):)|([/|.|w|s])*.(?:jpg|gif|png)")
Error:-
unknown escape sequence (and 2 more errors)
play link
go go asked Nov 17 '18 at 9:45
stack
105
asked Nov 17 '18 at 9:45
stack
105
asked Nov 17 '18 at 9:45
stack
105
asked Nov 17 '18 at 9:45
stack
105
asked Nov 17 '18 at 9:45
stack
105
105
I'd suggest using backtics when defining regex so that you won't have to escape ""
– ssemilla
Nov 17 '18 at 9:51
@ssemilla can you tell me what corrections
– stack
Nov 17 '18 at 9:52
Replace " with `. I didn't actually review your regex but people usually make mistakes when they mean "\" rather than "". Using backtics instead makes it very clear what we mean since nothing is escaped.
– ssemilla
Nov 17 '18 at 9:52
@ssemilla By using ` instead of " it runs but not working properly it prints nothing
– stack
Nov 17 '18 at 9:55
Why are you using!validation.MatchString()instead of justvalidation.MatchString()?
– ssemilla
Nov 17 '18 at 9:58
|
show 1 more comment
I'd suggest using backtics when defining regex so that you won't have to escape ""
– ssemilla
Nov 17 '18 at 9:51
@ssemilla can you tell me what corrections
– stack
Nov 17 '18 at 9:52
Replace " with `. I didn't actually review your regex but people usually make mistakes when they mean "\" rather than "". Using backtics instead makes it very clear what we mean since nothing is escaped.
– ssemilla
Nov 17 '18 at 9:52
@ssemilla By using ` instead of " it runs but not working properly it prints nothing
– stack
Nov 17 '18 at 9:55
Why are you using!validation.MatchString()instead of justvalidation.MatchString()?
– ssemilla
Nov 17 '18 at 9:58
I'd suggest using backtics when defining regex so that you won't have to escape ""
– ssemilla
Nov 17 '18 at 9:51
I'd suggest using backtics when defining regex so that you won't have to escape ""
– ssemilla
Nov 17 '18 at 9:51
@ssemilla can you tell me what corrections
– stack
Nov 17 '18 at 9:52
@ssemilla can you tell me what corrections
– stack
Nov 17 '18 at 9:52
Replace " with `. I didn't actually review your regex but people usually make mistakes when they mean "\" rather than "". Using backtics instead makes it very clear what we mean since nothing is escaped.
– ssemilla
Nov 17 '18 at 9:52
Replace " with `. I didn't actually review your regex but people usually make mistakes when they mean "\" rather than "". Using backtics instead makes it very clear what we mean since nothing is escaped.
– ssemilla
Nov 17 '18 at 9:52
@ssemilla By using ` instead of " it runs but not working properly it prints nothing
– stack
Nov 17 '18 at 9:55
@ssemilla By using ` instead of " it runs but not working properly it prints nothing
– stack
Nov 17 '18 at 9:55
Why are you using
!validation.MatchString() instead of just validation.MatchString()?– ssemilla
Nov 17 '18 at 9:58
Why are you using
!validation.MatchString() instead of just validation.MatchString()?– ssemilla
Nov 17 '18 at 9:58
|
show 1 more comment
1 Answer
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. is an invalid escape sequence. I would suggest you use backticks when defining regular expressions. e.g.
regexp.MustCompile(`^https?://.*.(jpg|gif|png)$`) // this will just check if the url ends with jpg,gif,png
If you are not using the capture groups, this is a simpler approach. However when parsing or validating URLs, use url.Parse() which provides better validation.
answered Nov 17 '18 at 10:23
ssemilla
3,077424
This might be a more proper regex for the URL:^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$which was taken from here: stackoverflow.com/questions/169625/…
– ssemilla
Nov 17 '18 at 10:43
if I used your code given regexp it was also correct?'
– stack
Nov 17 '18 at 11:44
It won't validate invalid URL characters. I suggest you use^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$if you really need a regex.
– ssemilla
Nov 17 '18 at 11:46
Ohh okay thanks for the nice answer :) @ssemilla
– stack
Nov 17 '18 at 12:00
add a comment |
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1 Answer
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. is an invalid escape sequence. I would suggest you use backticks when defining regular expressions. e.g.
regexp.MustCompile(`^https?://.*.(jpg|gif|png)$`) // this will just check if the url ends with jpg,gif,png
If you are not using the capture groups, this is a simpler approach. However when parsing or validating URLs, use url.Parse() which provides better validation.
answered Nov 17 '18 at 10:23
ssemilla
3,077424
This might be a more proper regex for the URL:^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$which was taken from here: stackoverflow.com/questions/169625/…
– ssemilla
Nov 17 '18 at 10:43
if I used your code given regexp it was also correct?'
– stack
Nov 17 '18 at 11:44
It won't validate invalid URL characters. I suggest you use^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$if you really need a regex.
– ssemilla
Nov 17 '18 at 11:46
Ohh okay thanks for the nice answer :) @ssemilla
– stack
Nov 17 '18 at 12:00
add a comment |
0
. is an invalid escape sequence. I would suggest you use backticks when defining regular expressions. e.g.
regexp.MustCompile(`^https?://.*.(jpg|gif|png)$`) // this will just check if the url ends with jpg,gif,png
If you are not using the capture groups, this is a simpler approach. However when parsing or validating URLs, use url.Parse() which provides better validation.
answered Nov 17 '18 at 10:23
ssemilla
3,077424
This might be a more proper regex for the URL:^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$which was taken from here: stackoverflow.com/questions/169625/…
– ssemilla
Nov 17 '18 at 10:43
if I used your code given regexp it was also correct?'
– stack
Nov 17 '18 at 11:44
It won't validate invalid URL characters. I suggest you use^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$if you really need a regex.
– ssemilla
Nov 17 '18 at 11:46
Ohh okay thanks for the nice answer :) @ssemilla
– stack
Nov 17 '18 at 12:00
add a comment |
0
0
0
. is an invalid escape sequence. I would suggest you use backticks when defining regular expressions. e.g.
regexp.MustCompile(`^https?://.*.(jpg|gif|png)$`) // this will just check if the url ends with jpg,gif,png
If you are not using the capture groups, this is a simpler approach. However when parsing or validating URLs, use url.Parse() which provides better validation.
answered Nov 17 '18 at 10:23
ssemilla
3,077424
. is an invalid escape sequence. I would suggest you use backticks when defining regular expressions. e.g.
regexp.MustCompile(`^https?://.*.(jpg|gif|png)$`) // this will just check if the url ends with jpg,gif,png
If you are not using the capture groups, this is a simpler approach. However when parsing or validating URLs, use url.Parse() which provides better validation.
answered Nov 17 '18 at 10:23
ssemilla
3,077424
edited Nov 17 '18 at 10:38
answered Nov 17 '18 at 10:23
ssemilla
3,077424
answered Nov 17 '18 at 10:23
ssemilla
3,077424
answered Nov 17 '18 at 10:23
ssemilla
3,077424
3,077424
This might be a more proper regex for the URL:^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$which was taken from here: stackoverflow.com/questions/169625/…
– ssemilla
Nov 17 '18 at 10:43
if I used your code given regexp it was also correct?'
– stack
Nov 17 '18 at 11:44
It won't validate invalid URL characters. I suggest you use^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$if you really need a regex.
– ssemilla
Nov 17 '18 at 11:46
Ohh okay thanks for the nice answer :) @ssemilla
– stack
Nov 17 '18 at 12:00
add a comment |
This might be a more proper regex for the URL:^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$which was taken from here: stackoverflow.com/questions/169625/…
– ssemilla
Nov 17 '18 at 10:43
if I used your code given regexp it was also correct?'
– stack
Nov 17 '18 at 11:44
It won't validate invalid URL characters. I suggest you use^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$if you really need a regex.
– ssemilla
Nov 17 '18 at 11:46
Ohh okay thanks for the nice answer :) @ssemilla
– stack
Nov 17 '18 at 12:00
This might be a more proper regex for the URL:
^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$ which was taken from here: stackoverflow.com/questions/169625/…– ssemilla
Nov 17 '18 at 10:43
This might be a more proper regex for the URL:
^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$ which was taken from here: stackoverflow.com/questions/169625/…– ssemilla
Nov 17 '18 at 10:43
if I used your code given regexp it was also correct?'
– stack
Nov 17 '18 at 11:44
if I used your code given regexp it was also correct?'
– stack
Nov 17 '18 at 11:44
It won't validate invalid URL characters. I suggest you use
^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$ if you really need a regex.– ssemilla
Nov 17 '18 at 11:46
It won't validate invalid URL characters. I suggest you use
^https?://(?:[a-z0-9-]+.)+[a-z]{2,6}(?:/[^/#?]+)+.(?:jpg|gif|png)$ if you really need a regex.– ssemilla
Nov 17 '18 at 11:46
Ohh okay thanks for the nice answer :) @ssemilla
– stack
Nov 17 '18 at 12:00
Ohh okay thanks for the nice answer :) @ssemilla
– stack
Nov 17 '18 at 12:00
add a comment |
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I'd suggest using backtics when defining regex so that you won't have to escape ""
– ssemilla
Nov 17 '18 at 9:51
@ssemilla can you tell me what corrections
– stack
Nov 17 '18 at 9:52
Replace " with `. I didn't actually review your regex but people usually make mistakes when they mean "\" rather than "". Using backtics instead makes it very clear what we mean since nothing is escaped.
– ssemilla
Nov 17 '18 at 9:52
@ssemilla By using ` instead of " it runs but not working properly it prints nothing
– stack
Nov 17 '18 at 9:55
Why are you using
!validation.MatchString()instead of justvalidation.MatchString()?– ssemilla
Nov 17 '18 at 9:58