Description:
------------
---
From manual page: http://www.php.net/regexp.reference.delimiters
---

IMHO it would be more clear to have an example like this:

/foo/
#foo#
+foo+
%foo%

instead of this:

/foo bar/
#^[^0-9]$#
+php+
%[a-zA-Z0-9_-]%

The existing example might be confusing for new users.