PHP正则表达式重复字符 [英] Php Regular Expression repeated characters

问题描述

我在php中有这样的字符串.

I have a string in php like this.

$ str ="ABCCCDE"//包含重复字符CCC超过2次

$str = "ABCCCDE" //Contains repeated character CCC more than 2 times

我想知道使用正则表达式是否有超过2次的重复字符.

I want to know if there is any repeated characters more than 2 times using regular expression.

预先感谢

推荐答案

if (preg_match('/(.)\\1{2}/', $str))
   echo "Has 3 same characters consecutively!";

(.)将匹配任何字符(换行符除外)，\1将匹配与第一个匹配组相同的模式-在这种情况下，我们刚刚匹配的字符.因此，此RegEx将匹配3个相同的连续字符.

The (.) will match any character (except new lines), and the \1 will match a pattern same as the first matched group — in this case, the character we've just matched. So this RegEx will match 3 same consecutive characters.

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