[pmwiki-devel] preg dot question...
editor at fast.st
Fri Dec 8 09:17:00 CST 2006
On 12/8/06, Patrick R. Michaud <pmichaud at pobox.com> wrote:
> On Fri, Dec 08, 2006 at 05:01:53AM -0500, The Editor wrote:
> > One other more advanced question. In a markup like [+++ text +++], I
> > think I can get it to match, but is there are anyway to tell how many
> > plusses there are? As in 3 as opposed to 1 or 4? Also to make sure
> > there are the same number of +'s at beginning and end? Or is this
> > asking too much of regex?
> To make sure there are an equivalent number of plusses on each side:
> $x = preg_replace('/\\[(\\++)(.*?)\\1\\]/', ... )
> The \1 in the pattern says to match whatever was matched by the
> first set of parens. So, if the first set of parens matches
> '+++', then the \1 has to also match '+++'.
> To obtain the number of characters matched, use /e and the strlen
> function in the replacement:
> $x = preg_replace('/\\[(\\++)(.*?)\\1\\]/e',
> "Function(strlen('$1'), '$2')", ...
> PmWiki does this already in several places for its standard
> markup (including [+...+] and [-...-]) -- for example, the
> markup for generating a !!! heading is
> Markup('^!', 'block',
> where strlen('$1') becomes the number of exclamation points
> that were used in the markup.
Ahh Pm, this is brilliant. Sheer brilliant. Thanks so much.
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