无法在Javascript中定义适当的RegEx

Question

I need to create a regular expression that matches a process number that has the following pattern #######-##.####.7.09.0009 where # means numbers from 0 to 9. Here is what I came up with after some research:

var regex = new RegExp("^[0-9]{7}[\-][0-9]{2}[\.][0-9]{4}[\.7\.09\.0009]$");

I also tried:

• /^[0-9]{7}\\-[0-9]{2}\\.[0-9]{4}\\.7\\.09\\.0009$/
• /^[0-9]{7}\\\\-[0-9]{2}\\\\.[0-9]{4}\\\\.7\\\\.09\\\\.0009$/

Answer 1

Try this:

const pattern = /\d{7}\-\d{2}\.\d{4}\.7\.09\.0009/

Regexper is a great tool that I use whenever I'm writing a regular expression, I find it really helps to visualize what the expression is actually doing. Check it out.

For reference, here is the original pattern that you posted -- it looks like the main problem is that you are defining character classes in several places using [ and ] where you really don't need them at all.