Javascript Regex: replace string with URL if not replaced already

Asked Aug 31 '20 at 13:13

Active Aug 31 '20 at 13:25

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I have the following problem that I'm trying to solve with String.replace:

I have a random text that contains IDs of tickets in some system e.g. JIRA-123. I want to replace then with Markdown links like so:

text.replace(/(JIRA-\d+)/g, "[$1](example.com?id=$1)");

The problem I'm struggling with is that I want this operation to be idempotent i.e. if a given ID is already wrapped in the URL I want it to be ignored and I'm struggling to figure out a correct expression to achieve that.

Any help?

edited Aug 31 '20 at 13:25

asked Aug 31 '20 at 13:13

Pawel Gorczynski

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First of all, `generateLink("$1")` is not working. – Wiktor Stribiżew Aug 31 '20 at 13:16
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Yes, so just follow the second linked thread: use a markdowned URL pattern (p1) and plain URL regex (p2) in an alternation, capture what you need to keep as is, and modify only what is matched and not captured (i.e. `s.replace(/(p1)|p2/g, (x,y) => y ? x : process(x))`) – Wiktor Stribiżew Aug 31 '20 at 13:32
@WiktorStribiżew Where does the ticket id `/(JIRA-\d+)/g` expression fit in this solution? – Pawel Gorczynski Aug 31 '20 at 14:29
Okay, I think you meant that p2 a ticket pattern - I think I got it working, thanks :) – Pawel Gorczynski Aug 31 '20 at 15:03

Javascript Regex: replace string with URL if not replaced already

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