[pmwiki-devel] Quick preg_replace question...

[Patrick R. Michaud]

On Fri, Apr 27, 2007 at 12:11:56PM -0400, The Editor wrote:
> >It's probably also a good idea to put a \b after [trc], so that
> >the markup engine won't inadvertently think that [citation]
> >is to be treated the same as [c].
> >
> >  '/(\n?)\[([trc]\\b)(.*?)\]/e'
> 
> \b will work whether the next character is a space or a ] ?  (the only
> two possibilities I'm concerned about...

\b matches if the previous character is alphanumeric and the
following one is not, or vice-versa.  In this case, it makes
certain that whatever follows the 't', 'r', or 'c' is not
a letter or digit.

> And to get it so it could take t1 or r3 could I do
> 
> '/(\n?)\[([trc][0-9]{0,1}\\b)(.*?)\]/e'

Shorter:

    /(\n?)\[([trc]\d?\\b)(.*?)\]/

Pm