intro.pcre.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Introduction</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="book.pcre.html">PCRE</a></div> <div class="next" style="text-align: right; float: right;"><a href="pcre.setup.html">Installing/Configuring</a></div> <div class="up"><a href="book.pcre.html">PCRE</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="intro.pcre" class="preface"> <h1 class="title">Introduction</h1> <p class="para"> The syntax for patterns used in these functions closely resembles Perl. The expression must 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. Since PHP 4.0.4, you can also use Perl-style (), {}, [], and <> matching delimiters. See <a href="reference.pcre.pattern.syntax.html" class="link">Pattern Syntax</a> for detailed explanation. </p> <p class="para"> The ending delimiter may be followed by various modifiers that affect the matching. See <a href="reference.pcre.pattern.modifiers.html" class="link">Pattern Modifiers</a>. </p> <p class="para"> PHP also supports regular expressions using a POSIX-extended syntax using the <a href="book.regex.html" class="link">POSIX-extended regex functions</a>. </p> <blockquote><p><b class="note">Note</b>: This extension maintains a global per-thread cache of compiled regular expressions (up to 4096). <br /> </p></blockquote> <div class="warning"><b class="warning">Warning</b> <p class="para"> You should be aware of some limitations of PCRE. Read <a href="http://www.pcre.org/pcre.txt" class="link external">» http://www.pcre.org/pcre.txt</a> for more info. </p> </div> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="book.pcre.html">PCRE</a></div> <div class="next" style="text-align: right; float: right;"><a href="pcre.setup.html">Installing/Configuring</a></div> <div class="up"><a href="book.pcre.html">PCRE</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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