PHP/JS 經常使用的正則表達式

正則表達式的都是匹配和替換

PHP

搜索

preg_match*

/**
 * int preg_match* ( string $pattern , string $subject [, array &$matches [, int $flags = 0 [, int $offset = 0 ]]] )
 * $pattern  正則表達式
 * $subject  要匹配的字符串
 * &$matches 匹配到的字符串
 * return    匹配到的個數，沒有匹配到返回0
 */

下面是例子

$pattern = "/\d{2}/";
$content = "12:34:56:78:9a";
// 執行一個正則表達式匹配， 非貪婪
if (preg_match ($pattern, $content, $m)){
    print_r($m);
}

// 執行一個全局正則表達式匹配， 貪婪
if ($c = preg_match_all($pattern, $content, $m)){
    echo "match numbers is ".$c."\n";
    print_r($m);
}

執行結果

$ php run.php
Array
(
    [0] => 12
)
match numbers is 4
Array
(
    [0] => Array
        (
            [0] => 12
            [1] => 34
            [2] => 56
            [3] => 78
        )
)

preg_grep

<?php
$pattern = "/^[a-z]*$/i";
$content = ["Mechanical Engineering",
            "Medicine",
            "Social Science",
            "Agriculture",
            "Commercial Science",
            "Politics" ];
// 匹配全部僅由有一個單詞組成的科目名
$alonewords = preg_grep($pattern, $content);
foreach($alonewords as $key => $value){
    echo $key.$value."\n";
}
?>

輸出結果

$ php run.php
1Medicine
3Agriculture
5Politics

替換

preg_replace

/**
 * mixed preg_replace ( mixed $pattern , mixed $replacement , mixed $subject [, int $limit = -1 [, int &$count ]] )
 * $pattern     正則表達式
 * $subject     要匹配的字符串
 * $replacement 用於替換的字符串或字符串數組, replacement和subject的類型相同
 * return       替換的後的對象，類型和subject相同
 */

例子

<?php
$content  = "Name: {Name}\nEmail: {Email}\nAddress: {Address}\n";
$patterns = ["/{Name}/", "/{Email}/", "/{Address}/"];
$replace  = ["Jaime", "xsu@viewtool.com", "Chongqing China"];
echo preg_replace($patterns, $replace, $content);
?>

輸出結果

$php run.php
Name: Jaime
Email: xsu@viewtool.com
Address: Chongqing China

這個至關於就是最簡單的模板實現了

php其餘

PHP preg:http://php.net/manual/zh/ref.pcre.php
下面有全部的函數手冊
preg_match
preg_match_all
preg_grep
preg_replace
preg_replace_callback
preg_replace_callback_array
preg_filter
grep_quote
grep_split
grep_last_error

PHP經常使用正則表達式彙總

---

javascript

若是是替換的正則表達式，能夠本身寫
若是僅僅是判斷，推薦使用is.js這個庫
官方網站
這裏就很少介紹了， 官網上的很是的清楚