According to http://www.regular-expressions.info/lookaround.html, PCRE and Java support
regular expressions with variable-length look-behinds, as long as the length has a
definite upper bound. It would be nice to have this kind of feature.
PS: I ran into this issue when trying to find all variables with a specific prefix
that appear exactly once in a file. I'm not a regex expert, so I'm not sure if it
should work, but here's my regex (split for readability:
\A
(?<\!\1) # Not preceded by first match
(\b(l|p|g|C)_\w{1,28}\b) # Matches e.g. "l_foo"
(?\!\1) # Not followed by first match
\Z
| Submitted | engmark - 2008-10-08 07:33:47 | Assigned | |
|---|---|---|---|
| Priority | 5 | Labels | |
| Status | open | Group | None |
| Resolution | None |