Javascript regex : repeating non-capturing group

Question

I'm working on a regex, but I can't make it work as I'd like.

The strings, 2 examples :

- /download?standard=yes&file=France_new-aquitaine_deux-sevres_europe_2.obf.zip

- /download?standard=yes&file=Afghanistan_asia_2.obf.zip

I want to extract following parts :

- country (France)  
- region (new-aquitaine)  
- department (deux-sèvres)  
- worldZone (europe)

My WIP regex :
/.*file=(?:(.*?)_{1})*?(?:\d\.obf\.zip)$/gi

Maybe there is a recursive way to handle it, I don't know.

Can you help or guide me ? Thanks.

Solved with :

/.*file=([^_]+)_(?:([^_]+)_)??(?:([^_]+)_)??([^_]+)_2\.obf\.zip$/g

This part: (?:(.*?)_{1})*? will only match the last occurence in a group. Instead separate the groups, you want to match, then you can access the captured groups (by index). — Poul Bak
– Poul Bak, Commented Mar 25, 2020 at 16:56

The fourth bird · Accepted Answer · 2020-03-25 16:57:34Z

2

One option could be using capturing groups and if you want to match the country and the region for the second string as well, you could make that part optional using an optional non capturing group (?:...)?

The parts are separated by an underscore. You could use a negated character class ([^_]+) matching any char except an underscore to capture the parts in between.

.*file=([^_]+)_([^_]+)(?:_([^_]+)_([^_]+))?_\d+\.obf\.zip$

Regex demo

answered Mar 25, 2020 at 16:57

The fourth bird

165k16 gold badges61 silver badges75 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Seraf Over a year ago

Thanks for your working answer. I've improved a little : .*file=([^_]+)_([^_]+)(?:_([^_]+)_([^_]+))?_\d+\.obf\.zip$

Collectives™ on Stack Overflow

Javascript regex : repeating non-capturing group

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related