正则表达式使用PHP中的preg_match查找多次出现的相同字符串的正确语法是什么?
例如,查找以下段落中是否在TWICE中出现以下字符串:
$string = "/brown fox jumped [0-9]/"; $paragraph = "The brown fox jumped 1 time over the fence. The green fox did not. Then the brown fox jumped 2 times over the fence" if (preg_match($string, $paragraph)) { echo "match found"; }else { echo "match NOT found"; }
您要使用preg_match_all()。这就是代码中的样子。实际函数返回找到的项目数,但$matches数组将保存结果:
preg_match_all()
$matches
<?php $string = "/brown fox jumped [0-9]/"; $paragraph = "The brown fox jumped 1 time over the fence. The green fox did not. Then the brown fox jumped 2 times over the fence"; if (preg_match_all($string, $paragraph, &$matches)) { echo count($matches[0]) . " matches found"; }else { echo "match NOT found"; } ?>
将输出:
找到2个匹配项