正则表达式匹配必须包含字符串中的所有字符

发布于 2024-09-30 00:35:28 字数 1000 浏览 4 评论 0原文

我确信这个问题已经被问过并得到回答，但老实说，在搜索了相当多的内容并阅读正则表达式教程。我想要做的是匹配一个与另一个字符串具有相同字符和长度的字符串。例如，字符串 "abcde" 会匹配 "edcba"，但不会匹配 "abcdf" 或 "aabbc"或<强>“abc”。

这是我的测试代码，其中最接近的是我想到的使用字符类的代码，但我无法弄清楚如何让正则表达式从比赛开始时基本上迭代类中的每个字符字符串：

$string = 'abcde';
$array  = array('edcba','eeeee','fghij','fedcba','qqq','cbaed','cba');
foreach ($array as $match)
{
    if (preg_match("/[$string]/i",$match))
        echo "TRUE  -> $match";
    else 
        echo "FALSE -> $match";
}

给出结果：

TRUE  -> edcba
TRUE  -> eeeee
FALSE -> fghij
TRUE  -> fedcba
FALSE -> qqq
TRUE  -> cbaed
TRUE  -> cba

当我真正想要的是：

TRUE  -> edcba 
FALSE -> eeeee  
FALSE -> fghij  
FALSE -> fedcba 
FALSE -> qqq    
TRUE  -> cbaed  
FALSE -> cba

原文

I'm sure this has already been asked and answered, but I honestly couldn't find my answer after searching for quite a bit and reading Regex Tutorial. What I'm looking to do is match a string that has the same characters and length as another string. For example, a string "abcde" would match "edcba" but would not match "abcdf" or "aabbc" or "abc".

Here is my test code with the closest I've come up with that uses a character class, but what I can't figure out is how to get regex to basically iterate through each character in the class once starting at the beginning of the match string:

$string = 'abcde';
$array  = array('edcba','eeeee','fghij','fedcba','qqq','cbaed','cba');
foreach ($array as $match)
{
    if (preg_match("/[$string]/i",$match))
        echo "TRUE  -> $match";
    else 
        echo "FALSE -> $match";
}

Which gives the result:

TRUE  -> edcba
TRUE  -> eeeee
FALSE -> fghij
TRUE  -> fedcba
FALSE -> qqq
TRUE  -> cbaed
TRUE  -> cba

When what I really want is:

TRUE  -> edcba 
FALSE -> eeeee  
FALSE -> fghij  
FALSE -> fedcba 
FALSE -> qqq    
TRUE  -> cbaed  
FALSE -> cba

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樱娆 2024-10-07 00:35:28

基本上，您正在检查anagrams。为什么不对字符串进行排序并比较是否相等？

$string = 'abcde';
$string = str_sort($string);  // sort the string.
$array  = array('edcba','eeeee','fghij','fedcba','qqq','cbaed','cba');
foreach ($array as $match) {
        $match = str_sort($match);  // sort each match.
        if (strcmp($match,$string) == 0)  // now string compare.
                echo "TRUE  -> $match\n";
        else
                echo "FALSE -> $match\n";
}

function str_sort($string) {
// function to sort a string..not the best but works :) 
        $tmp = str_split($string);
        sort($tmp);
        return implode('',$tmp);
}

实际代码

Basically you are checking for anagrams. Why not sort the strings and compare for equality?

$string = 'abcde';
$string = str_sort($string);  // sort the string.
$array  = array('edcba','eeeee','fghij','fedcba','qqq','cbaed','cba');
foreach ($array as $match) {
        $match = str_sort($match);  // sort each match.
        if (strcmp($match,$string) == 0)  // now string compare.
                echo "TRUE  -> $match\n";
        else
                echo "FALSE -> $match\n";
}

function str_sort($string) {
// function to sort a string..not the best but works :) 
        $tmp = str_split($string);
        sort($tmp);
        return implode('',$tmp);
}

Code In Action

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