JS：“正则表达式模式”？ OR字符串结尾”

Question

The strings are of two different types, I have a solution for each of them but I'm looking for a combined solution. For both I need the id '28ae569'.

• type A :

  s=' http://www.example.com/en/product/test-427/test-443/test-2289261/abc-28ae569?param1=category~%5b715507%7c208524%5d&bi=1&ps=200 '

Solved using : /.*\\/.*-(.*)\\?/

• type B :

  s=' http://www.example.com/en/product/test-427/test-443/test-2289261/abcdef-28ae569

Solved using : /.*\\/.*-(.*)$/

So what I'm trying to tell the regex is ' ? OR end of string '.

I've tried using ' \\?|$ 'but it did not work, it gives me the whole '28ae569?param1=category~%5b715507%7c208524%5d&bi=1&ps=200' in the first case. I also tried a number of other combinations, but I'm now shooting arrows in the dark.

Answer 1

You need to be more specific when using alternation using the pipe ( | ). You can use the following regex:

/([a-f\d]{3,})(?:\?|$)/i

([af\\d]{3,}) matches the required hexadecimal string. It also makes sure the string is at least 3 characters long. You can adjust this as per your requirements, or just change the quantifier to + if you don't mind single-digit strings like 0 being captured.

Note the parentheses around the alternation: (?:\\?|$) — it specifies that it should match either a ? or the end of the string. (?:...) is a non-capturing group .

With your previous regex, it would mean: match either .*\\/.*-(.*)\\? or the end of the string, which is not what you want.

RegEx Demo

Answer 2

Match consecutive digits followed by ? or $ , whichever comes first in the input string, as group 1.

/([a-fA-F0-9]+)(?:\?|$)/