I try to insert an optional whitespace. Somehow it's not working in the lookbehind.
Regex:
(?i)(?<=SomeValue\s=').*?(?=')
SomeValue='String2Find' (matches)
SomeValue ='String2Find' (not matching but should match)
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br0ken.pipe
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1What is your regex platform. If PCRE then `(?i)SomeValue\h*=\h*'\K[^']*(?=')` should work. – anubhava Feb 18 '20 at 08:00
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Where do you have optional whitespace in the regexp? – Barmar Feb 18 '20 at 08:00
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Updated the example with the error. Platform is C# – br0ken.pipe Feb 18 '20 at 08:05
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2C# supports variable length lookbehind. So `(?<=SomeValue\s*=\s*')[^']*(?=')` will work fine. Don't test that on regex101 as it doesn't support C# regex. – anubhava Feb 18 '20 at 08:09
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1All you need is `(?i)SomeValue\s*='([^']*)'` - and get Group 1 value. If you can't modify the code, just use `?` or `*` after `\s`. – Wiktor Stribiżew Feb 18 '20 at 08:21