.net vs JS regex issue

Question

I have a pretty complicated regex that i have finally managed to work in JS

  ^\s*((\(\s*([^]+\"|[@#a-zA-Z0-9_-åäöøæüßÅÄÖØÆÜ\-]+){1}(\s{1,}OR\s{1,}(\"[^\"]+\"|[@#a-zA-Z0-9_-åäöøæüßÅÄÖØÆÜ\-]+))*\s*\)))((\s{1,}(AND|NEAR(\/(100|[0-9][0-9]?)(?=\s))?)\s{1,})(\(\s*(\"[^\"]+\"|[@#a-zA-Z0-9_-åäöøæüßÅÄÖØÆÜ\-]+){1}(\s{1,}OR\s{1,}(\"[^\"]+\"|[@#a-zA-Z0-9_-åäöøæüßÅÄÖØÆÜ\-]+))*\s*\)))?(\s{1,}(AND\s{1,}NOT)\s{1,}(\(\s*(\"[^\"]+\"|[@#a-zA-Z0-9_-åäöøæüßÅÄÖØÆÜ\-]+){1}(\s{1,}OR\s{1,}(\"[^\"]+\"|[@#a-zA-Z0-9_-åäöøæüßÅÄÖØÆÜ\-]+))*\s*\)))?(?=(\s*\))?(\;)?\s*$)

with the text: (TITLE: "asdasd")

But when i send the text to my C# backend and uses the same regex it failes. Is there anywhere i can find out why it failes? I have tried some different online tools but none of them explain why it doesn't work.

I just need to be pointed in the right direction here since i'm pretty new working with regex. Thanks!

If you show us what strings you have, we might be of help simplifying your expression. — Jan
– Jan, Commented Dec 18, 2017 at 10:05
what do you mean by strings? Do you need more strings than the regex and the test string provided? — Daniel Gustafsson
– Daniel Gustafsson, Commented Dec 18, 2017 at 10:07
"the same regex" Are you sure it's the same regex - eg you've got the string escaping correct on the conversion to/from C# from JS - perhaps post exactly how you're using it in both JS and C#. — James Thorpe
– James Thorpe, Commented Dec 18, 2017 at 10:20
yeah i'm pretty sure of that. I acctually store the regexes in my backend and i call a method in my js to grab them from the backend. Also the js part is working as i want and i guess there is no need to escape the string when i create the regex string and test it in the same class of my c# code? — Daniel Gustafsson
– Daniel Gustafsson, Commented Dec 18, 2017 at 10:23
I have tried it in this two: js: regex101.com and .net: regexstorm.net/tester and there i get the same result. the test is working in regex101 and not in regexstorm :( — Daniel Gustafsson
– Daniel Gustafsson, Commented Dec 18, 2017 at 10:25

Sebastian Proske · Accepted Answer · 2017-12-18 10:38:52Z

1

The issue is [^] that you use in your expression. In JS syntax, it matches any character including newlines. In .net syntax, this is not a valid regex token.

You should be able to use [\s\S] as a replacement in both, matching any character including newlines.

answered Dec 18, 2017 at 10:38

Sebastian Proske

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5 Comments

Wiktor Stribiżew Over a year ago

@DanielGustafsson Don't use [\s\S], use . and pass the RegexOptions.Singleline option to the regex compiler. Native ways are always more efficient and more readable.

Sebastian Proske Over a year ago

@WiktorStribiżew I considered that, but afair there is no single-line option for JS regex.

Wiktor Stribiżew Over a year ago

I mean that . and RegexOptons.Singleline should be used in C#.

Sebastian Proske Over a year ago

@Wiktor If I read it correctly OP wants to use the same regex for both. If that is not needed, your comment should be prefered (and the JS regex could remain unchanged)

Daniel Gustafsson Over a year ago

Yeah i store them in the backend so that i have them in one place. Thanks tho!

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