Get a certain character after a regex match

Question

I am creating a JavaScript application and I need a regex for the following thing:

I have different strings that look like:

"./resources/red_B.png" or "./resources/red_1.png"

I want to get the character after the red_ text, so I want a Regex that returns the character B or 1.

I am not a Regex star so I was wondering if someone knows the solution to the problem.

What is your regex thus far? Post that. Show us where it's failing. Have you used sites like https://regexr.com ? — ProEvilz, Jun 17 '18 at 14:59

score 1 · Answer 1 · answered Jun 17 '18 at 15:10

1

Try Regex: \/resources\/red_\K(\w)

Demo

answered Jun 17 '18 at 15:10

Matt.G

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score 0 · Answer 2 · answered Jun 17 '18 at 15:04

0

i guess this is what you want:

red_(\w)+\.

catch it with groups in js as said in this link

answered Jun 17 '18 at 15:04

Stick

25
5

score 0 · Answer 3 · answered Jun 18 '18 at 07:55

You could match ./resources/red_ followed by capturing in a group not a dot using a negated character class ([^.]+)

\.\/resources\/red_([^.]+)

const strings = [
  "./resources/red_B.png",
  "./resources/red_1.png"
];
let pattern = /\.\/resources\/red_([^\.]+)/;
strings.forEach((s) => {
  console.log(s.match(pattern)[1]);
});

Get a certain character after a regex match

3 Answers3