Question

我设法实现了一个函数，通过在这个问题中使用@ridgerunner建议的解决方案将驼峰案例转换为单词：

Split camelCase word into words with php preg_match (Regular Expression)

但是，我还想处理这样的嵌入式缩写：

'hasABREVIATIONEmbedded'转换为'嵌入ABREVIATION'

我提出了这个解决方案：

    <?php 

    function camelCaseToWords($camelCaseStr)
    {

        // Convert: "TestASAPTestMore" to "TestASAP TestMore"

        $abreviationsPattern = '/' . // Match position between UPPERCASE "words"
            '(?<=[A-Z])' . // Position is after group of uppercase,
            '(?=[A-Z][a-z])' . // and before group of lowercase letters, except the last upper case letter in the group.
            '/x';
        $arr = preg_split($abreviationsPattern, $camelCaseStr);
        $str = implode(' ', $arr);

        // Convert "TestASAP TestMore" to "Test ASAP Test More"
        $camelCasePattern = '/' . // Match position between camelCase "words".
            '(?<=[a-z])' . // Position is after a lowercase,
            '(?=[A-Z])' . // and before an uppercase letter.
            '/x';

        $arr = preg_split($camelCasePattern, $str);
        $str = implode(' ', $arr);

        $str = ucfirst(trim($str));
        return $str;
    }

    $inputs = array(
    'oneTwoThreeFour',
    'StartsWithCap',
    'hasConsecutiveCAPS',
    'ALLCAPS',
    'ALL_CAPS_AND_UNDERSCORES',
    'hasABREVIATIONEmbedded',
    );

    echo "INPUT";

    foreach($inputs as $val) {
        echo "'" . $val . "' translates to '" . camelCaseToWords($val). "'\n";
    }

输出结果为：

    INPUT'oneTwoThreeFour' translates to 'One Two Three Four'
    'StartsWithCap' translates to 'Starts With Cap'
    'hasConsecutiveCAPS' translates to 'Has Consecutive CAPS'
    'ALLCAPS' translates to 'ALLCAPS'
    'ALL_CAPS_AND_UNDERSCORES' translates to 'ALL_CAPS_AND_UNDERSCORES'
    'hasABREVIATIONEmbedded' translates to 'Has ABREVIATION Embedded'

它按预期工作。

我的问题是：我可以组合2个正则表达式$ abreviationsPattern和camelCasePattern 所以我可以避免两次运行preg_split（）函数？

Answer 1

这些总是有趣的难题要解决;我把案件缩小到两个：

检测以大写字母开头，后跟小写字母（但不以字边界或主题开头）开头的单词 - (?<!\b)[A-Z][a-z]+

检测从小写到大写的转换 - (?<=[a-z])[A-Z]

function camelFix($str)
{
    return preg_replace_callback('/(?<!\b)[A-Z][a-z]+|(?<=[a-z])[A-Z]/', function($match) {
        return ' '. $match[0];
    }, $str);
}

它适用于您提供的输入;它可能会失败我没有预料到的情况：）

结合使用正则表达式将camelCase字符串拆分为单词

1 个答案: