如何用正则表达式检查特殊字符？

Question

In javascript I check for some characters but I want to allow underscores and slashes but I don't know how.

    alias: /^[a-z-Z0-9]{2,35}$/

How to put / and _ so it has not special meaning to Regexes.

Answer 1

_ has no special meaning at all in Regex.

And if a character has special meaning, you can use \\ to "despecialize" it.

alias: /^[a-zA-Z0-9_\/]{2,35}/

(BTW, you can use \\w which means [a-zA-Z0-9_] , ie /^[\\w\\/]{2,35}/ . The \\ in \\w turns a normal character w to have a special meaning.)

(Edit: Inside the […] the / will not be recognized as a delimiter so it is safe to use /^[\\w/]{2,35}/ . Thanks Andy E for showing this.)