REGEX-正则表达式模式匹配

Question

I've got a regex pattern that I've got to match. It should match the first three characters exactly and any other integer w/ alphabet combination like this:

ch_1q2ew34sdfsadf334f43tf4y6y, or ch_1343ggrgr or asdfasdf2234234

I've got this so far, it works but I want to make sure I'm doing this right:

/([c])+([h])+([_])+[\w\d\._%+-]+/

Is this right?

Answer 1

Your logic is correct but small changes in the syntax:

/ch_[\w\d._%+-]+/

• No need to put single character in [ ] and + here means match one or more characters.. i dont think you want to put that..
• No need to escape . inside character set..
• ( ) is a capture group and content captured inside a capture group can be back referenced with \\1 , \\2 , etc.. Use if you want to capture and dont if not required..