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>Perl-compatible Regular Expression functions</TITLE
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>XL. Perl-compatible Regular Expression functions</H1
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>&#13;    The syntax for patterns used in these functions closely resembles
    Perl. The expression should be enclosed in the delimiters, a
    forward slash (/),  for example.  Any character can be used for
    delimiter as long as it's not alphanumeric or backslash (\). If
    the delimiter character has to be used in the expression itself,
    it needs to be escaped by backslash.
   </P
><P
>&#13;    The ending delimiter may be followed by various modifiers that
    affect the matching. 
    See <A
HREF="pcre.pattern.modifiers.html"
>Pattern Modifiers</A
>.
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>Example 1. Examples of valid patterns</B
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>/&#60;\/\w+&#62;/</P
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>|(\d{3})-\d+|Sm</P
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>/^(?i)php[34]/</P
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>Example 2. Examples of invalid patterns</B
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>/href='(.*)' - missing ending delimiter</P
></LI
><LI
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>/\w+\s*\w+/J - unknown modifier 'J'</P
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>1-\d3-\d3-\d4| - missing starting delimiter</P
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>Note: </B
>
     The Perl-compatible regular expression functions are available in
     PHP 4 and in PHP 3.0.9 and up.
    </P
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><DT
><A
HREF="function.preg-match.html"
>preg_match</A
> &#8212; Perform a regular expression match</DT
><DT
><A
HREF="function.preg-match-all.html"
>preg_match_all</A
> &#8212; Perform a global regular expression match</DT
><DT
><A
HREF="function.preg-replace.html"
>preg_replace</A
> &#8212; Perform a regular expression search and replace</DT
><DT
><A
HREF="function.preg-split.html"
>preg_split</A
> &#8212; Split string by a regular expression</DT
><DT
><A
HREF="function.preg-quote.html"
>preg_quote</A
> &#8212; Quote regular expression characters</DT
><DT
><A
HREF="function.preg-grep.html"
>preg_grep</A
> &#8212; Return array entries that match the pattern</DT
><DT
><A
HREF="pcre.pattern.modifiers.html"
>Pattern Modifiers</A
> &#8212; describes possible modifiers in regex
     patterns</DT
><DT
><A
HREF="pcre.pattern.syntax.html"
>Pattern Syntax</A
> &#8212; describes PCRE regex syntax</DT
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