✅ – Hailwood – 00-51 Oct 7

Can someone please help me with some regex - Given strings like

"this definitely will not match"
"this min-h-32 should not match"
"this h-12 should match"
"this h-12-no not match"

"this definitely will not match"
"this min-h-32 should not match"
"this h-12 should match"
"this h-12-no not match"

I want to match if the string contains h-[numbers] The h-[numbers] can appear anywhere in the string (end,start,middle) but cannot be "touching" any other characters other that whitespace.

10 Replies

Rhys•3y ago

@Hailwood something like?

(?<=\s|^)h-(\d*)(?!\S)

(?<=\s|^)h-(\d*)(?!\S)

Rhys•3y ago

Referenced stackoverflow post: https://stackoverflow.com/questions/6713310/regex-specify-space-or-start-of-string-and-space-or-end-of-string

Stack Overflow

Regex: Specify "space or start of string" and "space or end of string"

Imagine you are trying to pattern match "stackoverflow". You want the following: this is stackoverflow and it rocks [MATCH] stackoverflow is the best [MATCH] i love stackoverflow [MATCH]

HailwoodOP•3y ago

@Rhys it looks good and works well in chrome etc.. any idea why in safari I'm getting

"Invalid regular expression: invalid group specifier name"?

'hello h-12 lol'.match(/(?<=\s|^)h-(\d*)(?!\S)/gm)

'hello h-12 lol'.match(/(?<=\s|^)h-(\d*)(?!\S)/gm)

Oh...https://caniuse.com/js-regexp-lookbehind Hmm, any thoughts on doing it without a lookbehind?

Rhys•3y ago

I'll do some tests and let you know @Hailwood , should be possible

Rhys•3y ago

@Hailwood here you go, I actually can explain this one haha (^|\ )h-(\d*)($|\ )

Rhys•3y ago

(^|\ ) - matches start of string or whitespace h- matches h- (\d*)- matches digits as a capture group ($\ )-matches end of string or whitespace

HailwoodOP•3y ago

Ahaha that's much simplier than I had in my head. Nice. Cheers!

Rhys•3y ago

👍 you can use a ✅ reaction on the solution to mark this as solved 🙂

reactibot•3y ago

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reactibot•3y ago

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