php怎么判断字符串中有连续4个的字符
PHP code<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?php $str = 'php怎么判断字符串中有连续4个的字符我我我我我';//$str = 'php怎么判断字符串中有连续4个的字符我我我我我sssssssss';if(preg_match("/(.)\\1{3,}/",$str)){ echo '有连续4个的字符';} else { echo '没有连续4个的字符';}?>
以上代码,只可判断英文,汉字不可用啊,有其它方法吗?
------解决方案--------------------UTF-8 汉字
if(preg_match("/([\x{4E00}-\x{9FFF}])\\1{3,}/u",$str)){
------解决方案--------------------对于 utf-8
preg_match("/(.)\\1{3,}/u",$str)
对于 gbk
preg_match("/([\x80-\xff].|.)\\1{3,}/",$str)
一个字符串不可能同时具有两种编码
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