doubiao1734 2017-02-15 09:45
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在php中查找具有特定字符串模式的子字符串

I want to find substring in a string with ___string_string___ pattern where string_string can be any string.

$string = "This string contains ___MY_VALUE___ which I want to replace and there is also ___ONE_MORE_VALUE___ which I want to replace";`
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  • dongxiong1935 2017-02-15 10:04
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    The solution using preg_replace_callback with specific regex pattern:

    // custom replacement list
    $pairs = ['___MY_VALUE___' => 123, '___ONE_MORE_VALUE___' => 456];
    $str = '"This string contains ___MY_VALUE___ which I want to replace and there is also ___ONE_MORE_VALUE___ which I want to replace";';
    
    $str = preg_replace_callback('/___(([a-z]+_?)+)___/mi', function($m) use($pairs){
        return (isset($pairs[$m[0]]))? $pairs[$m[0]] : $m[0];
    }, $str);
    
    print_r($str);
    

    The output:

    "This string contains 123 which I want to replace and there is also 456 which I want to replace";
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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