I'm trying to parse markdown with (\*\*|__).*?(\*\*|__). The problem I'm facing is, I will match a string that starts with for example capture group 1 (**) but ends with another (__). How can I make sure it uses the group which matched at the start, also at the end? Thanks :)
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2Use `/(\*\*|__).*?\1/` – anubhava Apr 23 '21 at 16:41
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2could you please explain what `\1` and `(?:(?!\1).)*?\1` does? I'm trying to learn from this, not just copy and paste. But thanks! :) – peter123 Apr 23 '21 at 16:43
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1[This](https://stackoverflow.com/questions/928179/matching-on-repeated-substrings-in-a-regex) explains what `\1` is. – Wiktor Stribiżew Apr 23 '21 at 16:47
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The solution is to replace the second capture group with \1.
For details see this comment by anubhava:
Use
/(\*\*|__).*?\1/
And this comment by Wiktor Stribiżew:
This explains what
\1is.
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1sorry, it was automatic, my mistake, i think i clicked on the wrong option – SpaceDogCS Apr 24 '21 at 12:19