Regex lookbehind assertion issue

Question

this is my current regex:

(?<=[\$T|\s|\p{P}|\$%\$%])sampleString

I want to match all sampleString in my richtextBox

and some instance of sample string in my richtextBox is something like this :

$TsampleString
$%$%sampleString

The problem is that my regex matches this : TsampleString, $sampleString, %sampleString.

How can I fix this regex lookbehind assertion? thanks

try typing TsampleString and the regex will match sampleString which I don't want to happen. the only characters need to be on the left side of sampleString is $T and $%$%, not T, $ and %. — neo, Aug 23 '12 at 03:17

JayC · Accepted Answer · 2012-08-23T03:59:00.053

You're building the regex wrong. You've got a character class (denoted by your square brackets) where you just want to list alternatives. Try:

(?<=\$T|\s|\p{P}|\$%\$%)sampleString

Edit: Wait, I just tested. Why are you using \p{P}? That's punctuation. % would be matched, among others.

Edit II: " the only characters need to be on the left side of sampleString is $T and $%$%"

Ok, that makes it simpler:

(?<=\$T|\$%\$%)sampleString

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