C# regex to find all spaces which are not behind a specified word -

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i'm having trouble create .net-regex finds spaces not behind word pi.

this given string "y + pi + s + 1 = x"

i tried "(?!pi\s)\s" finds every space , didn't exclude 1 after "pi". used .net regey tester

any appreciated

the issue regex it's looking double-space*: \s in look-behind makes "a space preceded 'p', 'i', '', not space preceded 'p', 'i'

the fix straightforward - remove \s lookbehind:

(?<!pi)\s

note regex skip spaces preceded longer words ending in pi well, such principi. if not want these matches, add \b in front of pi:

(?<!\bpi)\s

* note syntax lookbehind wasn't correct because of missing <. assume typo.


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