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提取由某些字符包裹的子字符串
原标题:Extracting a substring that is wrapped by some characters

使用常规表达式在一对划界器之间选择内容的 " 强度 " 最佳做法

aassssd [dddd] fff ffff (delimiter=[..])   output -> dddd
aassssd QddddQ fff ffff (delimiter=Q)      output -> dddd
aassssd RddddQ fff ffff (delimiters=R...Q) output -> dddd
aassssd "dddd" fff ffff (delimiter=")      output -> dddd

对排除划界器的关切是,选择整体比较容易:

/"[^"]"/ //for  line four

解决方案最好返回一个缩放器。 理想的答案只使用 RegEx, 可在 < a href=> http://regexpal.com/" rel="no follow" > http://regexpal. com/ 中测试。

最佳回答
aassssd [dddd] fff ffff (delimiter=[..])   output -> dddd

PHP 的 RegEx :

(?<=[).*?(?=])

JS Regex for JS(在PHP中也有工作):

[^[]*?(?=])
问题回答

我将使用非greedy < code>. *? 来捕捉最终分隔符之前的一切 :

$str =  aassssd QddddQ fff ffff ;
preg_match_all( /[Q](.*?)[Q]/ , $str, $out, PREG_PATTERN_ORDER);
var_dump($out); 

生产:

Array
(
    [0] => Array
        (
            [0] => QddddQ
        )

    [1] => Array
        (
            [0] => dddd
        )

)

您需要避开 [ ] 分隔符 : /[[[ ](*?] [ ]/

这将使用一个单捕捉组 (*?) , 所以输出数组中您需要的输出位置 1 。





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