duanhai4046 2017-08-15 12:29 采纳率: 100%
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PHP正则表达式匹配句子[重复]

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I am trying to compare two sentences using PHP and regex like this:

$data = "I am a happy man with 2 kids";
if (preg_match('/^(?=.*I)(?=.*am)(?=.*happy)(?=.*with)(?=.*2)(?=.*kids)/i', $data)) {echo 'match';} else {echo 'not match';}

and that seems to work fine, but if I change the sentence to:

$data = "I am a happy man with 20 kids";
if (preg_match('/^(?=.*I)(?=.*am)(?=.*happy)(?=.*with)(?=.*2)(?=.*kids)/i', $data)) {echo 'match';} else {echo 'not match';}

It's still saying that matches. The problem is that is not matching the exact number and just checking if theres a number 2 on the other sentence.

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  • dongyanfeng0546 2017-08-15 12:36
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    Add word boundaries:

    $data = "I am a happy man with 20 kids";
    if (preg_match('/^(?=.*I)(?=.*am)(?=.*happy)(?=.*with)(?=.*\b2\b)(?=.*kids)/i', $data)) {
    //                                                 here ___^^ ^^
        echo 'match';
    } else {
        echo 'not match';
    }
    

    You may want to add also in each lookahead, but the regex will become unredable

    $data = "I am a happy man with 20 kids";
    if (preg_match('/^(?=.*\bI\b)(?=.*\bam\b)(?=.*\bhappy\b)(?=.*\bwith\b)(?=.*\b2\b)(?=.*\bkids\b)/i', $data)) {
        echo 'match';
    } else {
        echo 'not match';
    }
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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