c# - Exactly one occurrence in regex -

c# - Exactly one occurrence in regex -

i have regex:

@"\s*[\( \[ \{]\s*[a]\s*[n]\s*[\} \] \)]\s*"

than detects string within 1 opening , closing braces: ( [ { if there number of spaces in string anywhere.

but problem detects 'an' if not within braces. how instruct regex observe string 'an' within 1 opening , closing braces.

abc abc should not match.

i want match string like:

abc [ ] abc abc { n } abc abc ( n ) abc

and can brackets type matched? mean possible match have closing bracket same opening bracket?

try removing spaces in square brackets. it's matching those.

@"\s*[\(\[\{]\s*[a]\s*[n]\s*[\}\]\)]\s*"

also, fwiw, pattern doesn't check ensure brackets same. get, e.g., [an} or (an].

to this, you'd need like:

\(\s*a\s*n\s*\)|\{\s*a\s*n\s*\}|\[\s*a\s*n\s*\]

i'm sure there's prettier way, it's escaping me right now.

c# asp.net .net regex