preg_match 멀티라인 정규표현식 예제
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m (PCRE_MULTILINE)
s (PCRE_DOTALL)
x (PCRE_EXTENDED)
e (PREG_REPLACE_EVAL)
U (PCRE_UNGREEDY)
$lineFirst = "This is a new first line<br>\r\n";
$lineLast = "This is a new last line<br>\r\n";
$page = <<<EOD
<html><head>
<title>This is a test page</title>
</head><body>
This is the first line<br>
Hi Fred<br>
Hi Bill<br>
This is the last line<br>
</body>
</html>
EOD;
$re = "/<body>.*^(.+)(^.*?^)(.+)(^<\\/body>.*?)/smU";
if (preg_match($re, $page, $aMatch, PREG_OFFSET_CAPTURE))
$newPage = substr($text, 0, $aMatch[1][1]) .
$lineFirst . $aMatch[2][0] .
$lineLast . $aMatch[4][0];
print $newPage;
http://php.net/manual/en/reference.pcre.pattern.modifiers.php
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