Description:
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From manual page: http://www.php.net/function.preg-replace#Parameters
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The preg_replace page only mentions the modifier "e" and I was unable to locate 
the PCRE pattern modifiers manual page until recently.

Suggest linking to 
"http://www.php.net/manual/en/reference.pcre.pattern.modifiers.php" under the 
Parameters -> patterns heading at "http://www.php.net/manual/en/function.preg-
replace.php".

Alternate suggestion would be to make a general reference to the PCRE Patterns 
section of the manual, The existence of this section is not mentioned on the 
preg_replace page and I found it difficult to locate.