Looking for characters within a string
5
I'm looking for a solution that checks if "alien characters" are contained in a string.
I found Check if a string contains a given character, which looks for one character only. However, I can't adopt this to my needs.
I.E.: Let the main string be asdf.
check{asdf}{asdfgh} should return true, because my main string is a true subset of my string asdfgh which contains non-alien characters.
check{asdf}{hgfdsa} should return true, too. Same as check{adfs}{hdagsf} - Sequence of chars doesn't matter, only occurence.
check{asdf}{asdghj} should return false, because the f character in main string is an alien as it is not in asdghj.
Any ideas welcome.
comparison
edited Jan 13 at 15:21
JouleV
2,344628
asked Jan 13 at 14:16
StringCheckerStringChecker
283
add a comment |
5
I'm looking for a solution that checks if "alien characters" are contained in a string.
I found Check if a string contains a given character, which looks for one character only. However, I can't adopt this to my needs.
I.E.: Let the main string be asdf.
check{asdf}{asdfgh} should return true, because my main string is a true subset of my string asdfgh which contains non-alien characters.
check{asdf}{hgfdsa} should return true, too. Same as check{adfs}{hdagsf} - Sequence of chars doesn't matter, only occurence.
check{asdf}{asdghj} should return false, because the f character in main string is an alien as it is not in asdghj.
Any ideas welcome.
comparison
edited Jan 13 at 15:21
JouleV
2,344628
asked Jan 13 at 14:16
StringCheckerStringChecker
283
add a comment |
5
5
5
0
I'm looking for a solution that checks if "alien characters" are contained in a string.
I found Check if a string contains a given character, which looks for one character only. However, I can't adopt this to my needs.
I.E.: Let the main string be asdf.
check{asdf}{asdfgh} should return true, because my main string is a true subset of my string asdfgh which contains non-alien characters.
check{asdf}{hgfdsa} should return true, too. Same as check{adfs}{hdagsf} - Sequence of chars doesn't matter, only occurence.
check{asdf}{asdghj} should return false, because the f character in main string is an alien as it is not in asdghj.
Any ideas welcome.
comparison
edited Jan 13 at 15:21
JouleV
2,344628
asked Jan 13 at 14:16
StringCheckerStringChecker
283
I'm looking for a solution that checks if "alien characters" are contained in a string.
I found Check if a string contains a given character, which looks for one character only. However, I can't adopt this to my needs.
I.E.: Let the main string be asdf.
check{asdf}{asdfgh} should return true, because my main string is a true subset of my string asdfgh which contains non-alien characters.
check{asdf}{hgfdsa} should return true, too. Same as check{adfs}{hdagsf} - Sequence of chars doesn't matter, only occurence.
check{asdf}{asdghj} should return false, because the f character in main string is an alien as it is not in asdghj.
Any ideas welcome.
comparison
comparison
edited Jan 13 at 15:21
JouleV
2,344628
asked Jan 13 at 14:16
StringCheckerStringChecker
283
edited Jan 13 at 15:21
JouleV
2,344628
asked Jan 13 at 14:16
StringCheckerStringChecker
283
edited Jan 13 at 15:21
JouleV
2,344628
edited Jan 13 at 15:21
JouleV
2,344628
edited Jan 13 at 15:21
JouleV
2,344628
2,344628
asked Jan 13 at 14:16
StringCheckerStringChecker
283
asked Jan 13 at 14:16
StringCheckerStringChecker
283
asked Jan 13 at 14:16
StringCheckerStringChecker
283
283
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
6
documentclass{article}
usepackage{xinttools}
makeatletter
newcommandmycheck[2]{%
xintFor*##1in{#1}:
{%
in@{##1}{#2}%
unlessifin@expandafterxintBreakForfi
}%
ifin@expandafter@firstoftwoelseexpandafter@secondoftwofi
}
makeatother
newcommandtest[2]{#1 in #2 ? mycheck{#1}{#2}{TRUE}{FALSE}}
begin{document}
test{asdf}{asdfgh}
test{asdf}{hgfdsa}
test{asdf}{asdghj}
end{document}
answered Jan 13 at 15:29
jfbujfbu
46.8k66149
1
@StringChecker completely forgot to say that with active characters you must use braces like thistest{{é}{ç}{à}}{pàqçzé},test{{é}{ç}{à}}{pàqzé}, with pdflatex (not with lualatex, xelatex). This applies to Babel shorhands too, naturally. And, with braces you can applymycheckalso to macros, even undefinedmycheck{{error}{undefined}}{aberrorcundefinedd}{TRUE}{FALSE}(can't usetesthere which will try to "print"#1={error}{undefined}and#2same problem)
– jfbu
Jan 13 at 18:14
reinserting my comment which can be useful for passers-bye that the case of empty list of characters as first argument is undecided (OP said it did not matter). Simply addin@trueorin@falsebefore thexintFor*loop depending on what is expected in case of empty list replacing theasdfof example.
– jfbu
Jan 14 at 10:32
add a comment |
8
You can test each item in the first string for being in the second string; at any “non match” stop and return false.
documentclass{article}
usepackage{xparse}
ExplSyntaxOn
NewDocumentCommand{checkTF}{mmmm}
{
stringchecker_if_string_in:nnTF { #1 } { #2 } { #3 } { #4 }
}
bool_new:N l__stringchecker_temp_bool
prg_new_protected_conditional:Nnn stringchecker_if_string_in:nn { T, F, TF }
{
% set the temporary boolean to true; it will remain such
% unless a nonmatch will happen
bool_set_true:N l__stringchecker_temp_bool
% map over the substring to find
str_map_inline:nn { #1 }
{
% do nothing if there is a match; ##1 is the current item, #2 the string to search in
str_if_in:nnF { #2 } { ##1 }
{
% a nonmatch breaks the mapping and sets the boolean to false
str_map_break:n { bool_set_false:N l__stringchecker_temp_bool }
}
}
bool_if:NTF l__stringchecker_temp_bool
{% there was no nonmatch, return true
prg_return_true:
}
{% a nonmatch was found, return false
prg_return_false:
}
}
ExplSyntaxOff
begin{document}
checkTF{asdf}{asdfgh}{TRUE}{FALSE}
checkTF{asdf}{hgfdsa}{TRUE}{FALSE}
checkTF{asdf}{asdghj}{TRUE}{FALSE}
checkTF{}{asdghj}{TRUE}{FALSE}
checkTF{a}{}{TRUE}{FALSE}
end{document}
A slightly more efficient version that absorbs one token at a time from the first argument.
documentclass{article}
usepackage{xparse}
ExplSyntaxOn
NewDocumentCommand{checkTF}{mmmm}
{
stringchecker_if_string_in:nnTF { #1 } { #2 } { #3 } { #4 }
}
prg_new_protected_conditional:Nnn stringchecker_if_string_in:nn { T, F, TF }
{
__stringchecker_check:nN { #2 } #1 q_nil
}
cs_new_protected:Nn __stringchecker_check:nN
{
quark_if_nil:NTF #2
{
prg_return_true:
}
{
str_if_in:nnTF { #1 } { #2 }
{
__stringchecker_check:nN { #1 }
}
{
__stringchecker_stop:w
}
}
}
cs_new:Npn __stringchecker_stop:w #1 q_nil
{
prg_return_false:
}
ExplSyntaxOff
begin{document}
checkTF{asdf}{asdfgh}{TRUE}{FALSE}
checkTF{asdf}{hgfdsa}{TRUE}{FALSE}
checkTF{asdf}{asdghj}{TRUE}{FALSE}
checkTF{}{asdghj}{TRUE}{FALSE}
checkTF{a}{}{TRUE}{FALSE}
end{document}
answered Jan 13 at 16:02
egregegreg
714k8618953184
add a comment |
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2 Answers
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active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
6
documentclass{article}
usepackage{xinttools}
makeatletter
newcommandmycheck[2]{%
xintFor*##1in{#1}:
{%
in@{##1}{#2}%
unlessifin@expandafterxintBreakForfi
}%
ifin@expandafter@firstoftwoelseexpandafter@secondoftwofi
}
makeatother
newcommandtest[2]{#1 in #2 ? mycheck{#1}{#2}{TRUE}{FALSE}}
begin{document}
test{asdf}{asdfgh}
test{asdf}{hgfdsa}
test{asdf}{asdghj}
end{document}
answered Jan 13 at 15:29
jfbujfbu
46.8k66149
1
@StringChecker completely forgot to say that with active characters you must use braces like thistest{{é}{ç}{à}}{pàqçzé},test{{é}{ç}{à}}{pàqzé}, with pdflatex (not with lualatex, xelatex). This applies to Babel shorhands too, naturally. And, with braces you can applymycheckalso to macros, even undefinedmycheck{{error}{undefined}}{aberrorcundefinedd}{TRUE}{FALSE}(can't usetesthere which will try to "print"#1={error}{undefined}and#2same problem)
– jfbu
Jan 13 at 18:14
reinserting my comment which can be useful for passers-bye that the case of empty list of characters as first argument is undecided (OP said it did not matter). Simply addin@trueorin@falsebefore thexintFor*loop depending on what is expected in case of empty list replacing theasdfof example.
– jfbu
Jan 14 at 10:32
add a comment |
6
documentclass{article}
usepackage{xinttools}
makeatletter
newcommandmycheck[2]{%
xintFor*##1in{#1}:
{%
in@{##1}{#2}%
unlessifin@expandafterxintBreakForfi
}%
ifin@expandafter@firstoftwoelseexpandafter@secondoftwofi
}
makeatother
newcommandtest[2]{#1 in #2 ? mycheck{#1}{#2}{TRUE}{FALSE}}
begin{document}
test{asdf}{asdfgh}
test{asdf}{hgfdsa}
test{asdf}{asdghj}
end{document}
answered Jan 13 at 15:29
jfbujfbu
46.8k66149
1
@StringChecker completely forgot to say that with active characters you must use braces like thistest{{é}{ç}{à}}{pàqçzé},test{{é}{ç}{à}}{pàqzé}, with pdflatex (not with lualatex, xelatex). This applies to Babel shorhands too, naturally. And, with braces you can applymycheckalso to macros, even undefinedmycheck{{error}{undefined}}{aberrorcundefinedd}{TRUE}{FALSE}(can't usetesthere which will try to "print"#1={error}{undefined}and#2same problem)
– jfbu
Jan 13 at 18:14
reinserting my comment which can be useful for passers-bye that the case of empty list of characters as first argument is undecided (OP said it did not matter). Simply addin@trueorin@falsebefore thexintFor*loop depending on what is expected in case of empty list replacing theasdfof example.
– jfbu
Jan 14 at 10:32
add a comment |
6
6
6
documentclass{article}
usepackage{xinttools}
makeatletter
newcommandmycheck[2]{%
xintFor*##1in{#1}:
{%
in@{##1}{#2}%
unlessifin@expandafterxintBreakForfi
}%
ifin@expandafter@firstoftwoelseexpandafter@secondoftwofi
}
makeatother
newcommandtest[2]{#1 in #2 ? mycheck{#1}{#2}{TRUE}{FALSE}}
begin{document}
test{asdf}{asdfgh}
test{asdf}{hgfdsa}
test{asdf}{asdghj}
end{document}
answered Jan 13 at 15:29
jfbujfbu
46.8k66149
documentclass{article}
usepackage{xinttools}
makeatletter
newcommandmycheck[2]{%
xintFor*##1in{#1}:
{%
in@{##1}{#2}%
unlessifin@expandafterxintBreakForfi
}%
ifin@expandafter@firstoftwoelseexpandafter@secondoftwofi
}
makeatother
newcommandtest[2]{#1 in #2 ? mycheck{#1}{#2}{TRUE}{FALSE}}
begin{document}
test{asdf}{asdfgh}
test{asdf}{hgfdsa}
test{asdf}{asdghj}
end{document}
answered Jan 13 at 15:29
jfbujfbu
46.8k66149
answered Jan 13 at 15:29
jfbujfbu
46.8k66149
answered Jan 13 at 15:29
jfbujfbu
46.8k66149
answered Jan 13 at 15:29
jfbujfbu
46.8k66149
46.8k66149
1
@StringChecker completely forgot to say that with active characters you must use braces like thistest{{é}{ç}{à}}{pàqçzé},test{{é}{ç}{à}}{pàqzé}, with pdflatex (not with lualatex, xelatex). This applies to Babel shorhands too, naturally. And, with braces you can applymycheckalso to macros, even undefinedmycheck{{error}{undefined}}{aberrorcundefinedd}{TRUE}{FALSE}(can't usetesthere which will try to "print"#1={error}{undefined}and#2same problem)
– jfbu
Jan 13 at 18:14
reinserting my comment which can be useful for passers-bye that the case of empty list of characters as first argument is undecided (OP said it did not matter). Simply addin@trueorin@falsebefore thexintFor*loop depending on what is expected in case of empty list replacing theasdfof example.
– jfbu
Jan 14 at 10:32
add a comment |
1
@StringChecker completely forgot to say that with active characters you must use braces like thistest{{é}{ç}{à}}{pàqçzé},test{{é}{ç}{à}}{pàqzé}, with pdflatex (not with lualatex, xelatex). This applies to Babel shorhands too, naturally. And, with braces you can applymycheckalso to macros, even undefinedmycheck{{error}{undefined}}{aberrorcundefinedd}{TRUE}{FALSE}(can't usetesthere which will try to "print"#1={error}{undefined}and#2same problem)
– jfbu
Jan 13 at 18:14
reinserting my comment which can be useful for passers-bye that the case of empty list of characters as first argument is undecided (OP said it did not matter). Simply addin@trueorin@falsebefore thexintFor*loop depending on what is expected in case of empty list replacing theasdfof example.
– jfbu
Jan 14 at 10:32
1
1
@StringChecker completely forgot to say that with active characters you must use braces like this
test{{é}{ç}{à}}{pàqçzé}, test{{é}{ç}{à}}{pàqzé}, with pdflatex (not with lualatex, xelatex). This applies to Babel shorhands too, naturally. And, with braces you can apply mycheck also to macros, even undefined mycheck{{error}{undefined}}{aberrorcundefinedd}{TRUE}{FALSE} (can't use test here which will try to "print" #1={error}{undefined} and #2 same problem)– jfbu
Jan 13 at 18:14
@StringChecker completely forgot to say that with active characters you must use braces like this
test{{é}{ç}{à}}{pàqçzé}, test{{é}{ç}{à}}{pàqzé}, with pdflatex (not with lualatex, xelatex). This applies to Babel shorhands too, naturally. And, with braces you can apply mycheck also to macros, even undefined mycheck{{error}{undefined}}{aberrorcundefinedd}{TRUE}{FALSE} (can't use test here which will try to "print" #1={error}{undefined} and #2 same problem)– jfbu
Jan 13 at 18:14
reinserting my comment which can be useful for passers-bye that the case of empty list of characters as first argument is undecided (OP said it did not matter). Simply add
in@true or in@false before the xintFor* loop depending on what is expected in case of empty list replacing the asdf of example.– jfbu
Jan 14 at 10:32
reinserting my comment which can be useful for passers-bye that the case of empty list of characters as first argument is undecided (OP said it did not matter). Simply add
in@true or in@false before the xintFor* loop depending on what is expected in case of empty list replacing the asdf of example.– jfbu
Jan 14 at 10:32
add a comment |
8
You can test each item in the first string for being in the second string; at any “non match” stop and return false.
documentclass{article}
usepackage{xparse}
ExplSyntaxOn
NewDocumentCommand{checkTF}{mmmm}
{
stringchecker_if_string_in:nnTF { #1 } { #2 } { #3 } { #4 }
}
bool_new:N l__stringchecker_temp_bool
prg_new_protected_conditional:Nnn stringchecker_if_string_in:nn { T, F, TF }
{
% set the temporary boolean to true; it will remain such
% unless a nonmatch will happen
bool_set_true:N l__stringchecker_temp_bool
% map over the substring to find
str_map_inline:nn { #1 }
{
% do nothing if there is a match; ##1 is the current item, #2 the string to search in
str_if_in:nnF { #2 } { ##1 }
{
% a nonmatch breaks the mapping and sets the boolean to false
str_map_break:n { bool_set_false:N l__stringchecker_temp_bool }
}
}
bool_if:NTF l__stringchecker_temp_bool
{% there was no nonmatch, return true
prg_return_true:
}
{% a nonmatch was found, return false
prg_return_false:
}
}
ExplSyntaxOff
begin{document}
checkTF{asdf}{asdfgh}{TRUE}{FALSE}
checkTF{asdf}{hgfdsa}{TRUE}{FALSE}
checkTF{asdf}{asdghj}{TRUE}{FALSE}
checkTF{}{asdghj}{TRUE}{FALSE}
checkTF{a}{}{TRUE}{FALSE}
end{document}
A slightly more efficient version that absorbs one token at a time from the first argument.
documentclass{article}
usepackage{xparse}
ExplSyntaxOn
NewDocumentCommand{checkTF}{mmmm}
{
stringchecker_if_string_in:nnTF { #1 } { #2 } { #3 } { #4 }
}
prg_new_protected_conditional:Nnn stringchecker_if_string_in:nn { T, F, TF }
{
__stringchecker_check:nN { #2 } #1 q_nil
}
cs_new_protected:Nn __stringchecker_check:nN
{
quark_if_nil:NTF #2
{
prg_return_true:
}
{
str_if_in:nnTF { #1 } { #2 }
{
__stringchecker_check:nN { #1 }
}
{
__stringchecker_stop:w
}
}
}
cs_new:Npn __stringchecker_stop:w #1 q_nil
{
prg_return_false:
}
ExplSyntaxOff
begin{document}
checkTF{asdf}{asdfgh}{TRUE}{FALSE}
checkTF{asdf}{hgfdsa}{TRUE}{FALSE}
checkTF{asdf}{asdghj}{TRUE}{FALSE}
checkTF{}{asdghj}{TRUE}{FALSE}
checkTF{a}{}{TRUE}{FALSE}
end{document}
answered Jan 13 at 16:02
egregegreg
714k8618953184
add a comment |
8
You can test each item in the first string for being in the second string; at any “non match” stop and return false.
documentclass{article}
usepackage{xparse}
ExplSyntaxOn
NewDocumentCommand{checkTF}{mmmm}
{
stringchecker_if_string_in:nnTF { #1 } { #2 } { #3 } { #4 }
}
bool_new:N l__stringchecker_temp_bool
prg_new_protected_conditional:Nnn stringchecker_if_string_in:nn { T, F, TF }
{
% set the temporary boolean to true; it will remain such
% unless a nonmatch will happen
bool_set_true:N l__stringchecker_temp_bool
% map over the substring to find
str_map_inline:nn { #1 }
{
% do nothing if there is a match; ##1 is the current item, #2 the string to search in
str_if_in:nnF { #2 } { ##1 }
{
% a nonmatch breaks the mapping and sets the boolean to false
str_map_break:n { bool_set_false:N l__stringchecker_temp_bool }
}
}
bool_if:NTF l__stringchecker_temp_bool
{% there was no nonmatch, return true
prg_return_true:
}
{% a nonmatch was found, return false
prg_return_false:
}
}
ExplSyntaxOff
begin{document}
checkTF{asdf}{asdfgh}{TRUE}{FALSE}
checkTF{asdf}{hgfdsa}{TRUE}{FALSE}
checkTF{asdf}{asdghj}{TRUE}{FALSE}
checkTF{}{asdghj}{TRUE}{FALSE}
checkTF{a}{}{TRUE}{FALSE}
end{document}
A slightly more efficient version that absorbs one token at a time from the first argument.
documentclass{article}
usepackage{xparse}
ExplSyntaxOn
NewDocumentCommand{checkTF}{mmmm}
{
stringchecker_if_string_in:nnTF { #1 } { #2 } { #3 } { #4 }
}
prg_new_protected_conditional:Nnn stringchecker_if_string_in:nn { T, F, TF }
{
__stringchecker_check:nN { #2 } #1 q_nil
}
cs_new_protected:Nn __stringchecker_check:nN
{
quark_if_nil:NTF #2
{
prg_return_true:
}
{
str_if_in:nnTF { #1 } { #2 }
{
__stringchecker_check:nN { #1 }
}
{
__stringchecker_stop:w
}
}
}
cs_new:Npn __stringchecker_stop:w #1 q_nil
{
prg_return_false:
}
ExplSyntaxOff
begin{document}
checkTF{asdf}{asdfgh}{TRUE}{FALSE}
checkTF{asdf}{hgfdsa}{TRUE}{FALSE}
checkTF{asdf}{asdghj}{TRUE}{FALSE}
checkTF{}{asdghj}{TRUE}{FALSE}
checkTF{a}{}{TRUE}{FALSE}
end{document}
answered Jan 13 at 16:02
egregegreg
714k8618953184
add a comment |
8
8
8
You can test each item in the first string for being in the second string; at any “non match” stop and return false.
documentclass{article}
usepackage{xparse}
ExplSyntaxOn
NewDocumentCommand{checkTF}{mmmm}
{
stringchecker_if_string_in:nnTF { #1 } { #2 } { #3 } { #4 }
}
bool_new:N l__stringchecker_temp_bool
prg_new_protected_conditional:Nnn stringchecker_if_string_in:nn { T, F, TF }
{
% set the temporary boolean to true; it will remain such
% unless a nonmatch will happen
bool_set_true:N l__stringchecker_temp_bool
% map over the substring to find
str_map_inline:nn { #1 }
{
% do nothing if there is a match; ##1 is the current item, #2 the string to search in
str_if_in:nnF { #2 } { ##1 }
{
% a nonmatch breaks the mapping and sets the boolean to false
str_map_break:n { bool_set_false:N l__stringchecker_temp_bool }
}
}
bool_if:NTF l__stringchecker_temp_bool
{% there was no nonmatch, return true
prg_return_true:
}
{% a nonmatch was found, return false
prg_return_false:
}
}
ExplSyntaxOff
begin{document}
checkTF{asdf}{asdfgh}{TRUE}{FALSE}
checkTF{asdf}{hgfdsa}{TRUE}{FALSE}
checkTF{asdf}{asdghj}{TRUE}{FALSE}
checkTF{}{asdghj}{TRUE}{FALSE}
checkTF{a}{}{TRUE}{FALSE}
end{document}
A slightly more efficient version that absorbs one token at a time from the first argument.
documentclass{article}
usepackage{xparse}
ExplSyntaxOn
NewDocumentCommand{checkTF}{mmmm}
{
stringchecker_if_string_in:nnTF { #1 } { #2 } { #3 } { #4 }
}
prg_new_protected_conditional:Nnn stringchecker_if_string_in:nn { T, F, TF }
{
__stringchecker_check:nN { #2 } #1 q_nil
}
cs_new_protected:Nn __stringchecker_check:nN
{
quark_if_nil:NTF #2
{
prg_return_true:
}
{
str_if_in:nnTF { #1 } { #2 }
{
__stringchecker_check:nN { #1 }
}
{
__stringchecker_stop:w
}
}
}
cs_new:Npn __stringchecker_stop:w #1 q_nil
{
prg_return_false:
}
ExplSyntaxOff
begin{document}
checkTF{asdf}{asdfgh}{TRUE}{FALSE}
checkTF{asdf}{hgfdsa}{TRUE}{FALSE}
checkTF{asdf}{asdghj}{TRUE}{FALSE}
checkTF{}{asdghj}{TRUE}{FALSE}
checkTF{a}{}{TRUE}{FALSE}
end{document}
answered Jan 13 at 16:02
egregegreg
714k8618953184
You can test each item in the first string for being in the second string; at any “non match” stop and return false.
documentclass{article}
usepackage{xparse}
ExplSyntaxOn
NewDocumentCommand{checkTF}{mmmm}
{
stringchecker_if_string_in:nnTF { #1 } { #2 } { #3 } { #4 }
}
bool_new:N l__stringchecker_temp_bool
prg_new_protected_conditional:Nnn stringchecker_if_string_in:nn { T, F, TF }
{
% set the temporary boolean to true; it will remain such
% unless a nonmatch will happen
bool_set_true:N l__stringchecker_temp_bool
% map over the substring to find
str_map_inline:nn { #1 }
{
% do nothing if there is a match; ##1 is the current item, #2 the string to search in
str_if_in:nnF { #2 } { ##1 }
{
% a nonmatch breaks the mapping and sets the boolean to false
str_map_break:n { bool_set_false:N l__stringchecker_temp_bool }
}
}
bool_if:NTF l__stringchecker_temp_bool
{% there was no nonmatch, return true
prg_return_true:
}
{% a nonmatch was found, return false
prg_return_false:
}
}
ExplSyntaxOff
begin{document}
checkTF{asdf}{asdfgh}{TRUE}{FALSE}
checkTF{asdf}{hgfdsa}{TRUE}{FALSE}
checkTF{asdf}{asdghj}{TRUE}{FALSE}
checkTF{}{asdghj}{TRUE}{FALSE}
checkTF{a}{}{TRUE}{FALSE}
end{document}
A slightly more efficient version that absorbs one token at a time from the first argument.
documentclass{article}
usepackage{xparse}
ExplSyntaxOn
NewDocumentCommand{checkTF}{mmmm}
{
stringchecker_if_string_in:nnTF { #1 } { #2 } { #3 } { #4 }
}
prg_new_protected_conditional:Nnn stringchecker_if_string_in:nn { T, F, TF }
{
__stringchecker_check:nN { #2 } #1 q_nil
}
cs_new_protected:Nn __stringchecker_check:nN
{
quark_if_nil:NTF #2
{
prg_return_true:
}
{
str_if_in:nnTF { #1 } { #2 }
{
__stringchecker_check:nN { #1 }
}
{
__stringchecker_stop:w
}
}
}
cs_new:Npn __stringchecker_stop:w #1 q_nil
{
prg_return_false:
}
ExplSyntaxOff
begin{document}
checkTF{asdf}{asdfgh}{TRUE}{FALSE}
checkTF{asdf}{hgfdsa}{TRUE}{FALSE}
checkTF{asdf}{asdghj}{TRUE}{FALSE}
checkTF{}{asdghj}{TRUE}{FALSE}
checkTF{a}{}{TRUE}{FALSE}
end{document}
answered Jan 13 at 16:02
egregegreg
714k8618953184
edited Jan 13 at 20:58
answered Jan 13 at 16:02
egregegreg
714k8618953184
answered Jan 13 at 16:02
egregegreg
714k8618953184
answered Jan 13 at 16:02
egregegreg
714k8618953184
714k8618953184
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