$string = "April 15, 2003";
$pattern = "/(\w+) (\d+), (\d+)/i";
$replacement = "\${1}1,\$3";
print preg_replace($pattern, $replacement, $string);
preg_match_all()进行全局正则表达式匹配
语法格式：
复制代码 代码如下:
preg_match_all ("|<[^>]+>(.*)</[^>]+>|U",
"<b>example: </b><div align=left>this is a test</div>",
$out, PREG_PATTERN_ORDER);
print $out[0][0].", ".$out[0][1]."
";
print $out[1][0].", ".$out[1][1]."
";
输出结果：<b>example: </b>, <div align=left>this is a test</div> example: , this is a test
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