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我的 php 代码中有一个正则表达式，它应该匹配每个数字和所有“运算符”+-*/^r() 我的正则表达式看起来像这样

/(?:(\d+(?:\.\d+)|(\+)|(-)|(\*)|(\/)|(\^)|(r)|(\()|(\))))/

当使用字符串进行测试时，preg_match_all($expression,"2+2",$results)它会返回给我

Array
(
    [0] => Array
        (
            [0] => '+'
        )

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

    [2] => Array
        (
            [0] => '+'
        )

    [3] => Array
        (
           [0] => ''
        )

    [4] => Array
        (
            [0] => ''
    )

    [5] => Array
        (
            [0] => ''
        )

    [6] => Array
        (
            [0] => ''
        )

    [7] => Array
        (
            [0] => ''
        )

    [8] => Array
        (    
            [0] => ''
        )

    [9] => Array
        (
            [0] => ''
        )

)

什么时候（如果它工作正常）我应该得到这个

Array
(
    [0] => Array
        (
            [0] => '2'
            [1] => '+'
            [2] => '2'
        )

    [1] => Array
        (
            [0] => '2'
            [1] => ''
            [2] => '2'
        )

    [2] => Array
        (
            [0] => ''
            [1] => '+'
            [2] = > ''
        )

    [3] => Array
        (
           [0] => ''
           [1] => ''
           [2] => ''
        )

    [4] => Array
        (
           [0] => ''
           [1] => ''
           [2] => ''
        )
    ...

)

请注意，它为所有运算符返回类似的行为，它似乎完全忽略了数字

请注意，我确实需要单独的捕获组，因此每个结果都有不同的匹配索引

4

1 回答 1

1

你可以简单地这样做：

$pattern = '~\d+(?:\.\d+)?|[-+*/^r()]~';
于 2013-07-12T15:02:00.747 回答