duanlie7962 2017-05-04 10:12
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PHP正则表达式提取特殊字符串

I am trying to use regex to extract a certain syntax, in my case something like "10.100" or "20.111", in which 2 numbers are separated by dot(.) . So if I provide "a 10.100", it will extract 10.100 from the string. If I provide "a 10.100 20.101", it will extract 10.100 and 20.101.

Until now I have tried to use

preg_match('/^.*([0-9]{1,2})[^\.]([0-9]{1,4}).*$/', $message, $array);

but still no luck. Please provide any suggestion because I don't have strong regex knowledge. Thanks.

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  • drozwmi5440 2017-05-04 10:14
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    You may use

    \b[0-9]{1,2}\.[0-9]{1,4}\b
    

    See the regex demo.

    Details:

    • \b - a leading word boundary
    • [0-9]{1,2} - 1 or 2 digits
    • \. - a dot
    • [0-9]{1,4} - 1 to 4 digits
    • \b - a trailing word boundary.

    If you do not care about the whole word option, just remove \b. Also, to match just 1 or more digits, you may use + instead of the limiting quantifiers. So, perhaps

    [0-9]+\.[0-9]+
    

    will also work for you.

    See a PHP demo:

    $re = '/[0-9]+\.[0-9]+/';
    $str = 'I am trying to use regex to extract a certain syntax, in my case something like "10.100" or "20.111", in which 2 numbers are separated by dot(.) . So if I provide "a 10.100", it will extract 10.100 from the string. If I provide "a 10.100 20.101", it will extract 10.100 and 20.101.';
    preg_match_all($re, $str, $matches);
    print_r($matches[0]);
    

    Output:

    Array
    (
        [0] => 10.100
        [1] => 20.111
        [2] => 10.100
        [3] => 10.100
        [4] => 10.100
        [5] => 20.101
        [6] => 10.100
        [7] => 20.101
    )
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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