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                preg_match() - http://php.net/manual/zh/function.preg-match.php preg_match_all() - http://php.net/manual/zh/function.preg-match-all.php 返回所有結果 `preg_replace($pattern,$replacement,$subject)` 只返回匹配替換的結果 `preg_filter($pattern,$replacement,$subject) ` `preg_grep($pattern,array $input) ` 相當于閹割版 preg_filter(…) 只匹配不替換, `preg_split($pattern,$subject) // explode()` `preg_quote($str) //正則運算符轉義` 總結: 都是以`preg_`開頭,除了`preg_quote`函數外,第一個參數都是正則表達式, ~~~ preg_match // 表單驗證等 preg_replace // 非法詞語過濾等 ~~~
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