Regex 匹配字母数字字符、 下划线、 时段和破折符, 允许点与破折符只在中间
原文：Regex to match alphanumeric characters, underscore, periods and dash, allowing dot and dash only in the middle
原文：Regex to match alphanumeric characters, underscore, periods and dash, allowing dot and dash only in the middle
目前,我使用这个:如果(preg_match (/ {(a- zA-ZA-Z0- 9_)]+([a- zA-Z0- 9_]**.**?[a- zA-Z0-9_]**[a- zA-Z0- 9_]+$/, $product)) {返回真实的 {( ) {其他 { 返回假的} 例如,我想...