我想将大多数字符串转换为小写,除了括号内的那些字符.将括号外的所有内容转换为小写后,我想删除括号.因此,将{H} ell {o}世界作为输入应该将Hello world作为输出.删除括号很简单,但是有没有办法用正则表达式选择性地使括号小写之外的所有内容？如果没有简单的正则表达式解决方案,那么在javascript中最简单的方法是什么？
最佳答案
你可以试试这个：
@H_301_10@var str='{H}ell{o} World'; str = str.replace(/{([^}]*)}|[^{]+/g,function (m,p1) { return (p1)? p1 : m.toLowerCase();} ); console.log(str);
模式匹配：
@H_301_10@{([^}]*)} # all that is between curly brackets # and put the content in the capture group 1 | # OR [^{]+ # anything until the regex engine meet a { # since the character class is all characters but {
回调函数有两个参数：
完全匹配
p1第一个捕获组
如果p1不为空,则返回p1
否则整个匹配m是小写的.
细节：
@H_301_10@"{H}" p1 contains H (first part of the alternation) p1 is return as it. Note that since the curly brackets are not captured,they are not in the result. -->"H" "ell" (second part of the alternation) p1 is empty,the full match is returned in lowercase -->"ell" "{o}" (first part) -->"o" " World" (second part) -->" world"
