Rails regex for specific pattern

Question

I need to grab the first occurrence of this pattern [some-file-name ci] OR [some-file-name-ci.yml ci]

So far I'm able to create this pattern

CONFIG_FILE_PATTERN = /\[(\w*[ _-]ci|\w*[ _-]*\.yml ci|.\w*[ _-]*\.yml ci|.\w*[-_]\w*[ _-]*\.yml ci|\w*[-_]\w*[ _-]*\.yml ci|\w*[-_]\w*[ _-]*\w ci|.\w*[-_]\w*[ _-]*\w ci)\]/i.freeze

This works fine for all cases except when there are multiple hyphens (-) in the file name.

Examples:

[hello-ci.yml ci] # works fine for this
[hello.yml ci] # works fine for this
[hello ci] # works fine for this
[hello-world-ci.yml ci] # does not work for this as the file name now have multiple hyphens

Any help will be appreciated.

I think all you need is /\[([^\]\[]*ci)\]/i. See a Rubular demo. Or, /\[([^\]\[]*[ _-]ci)]/i if there must be space, _ or - before ci — Wiktor Stribiżew
– Wiktor Stribiżew, Commented May 6, 2020 at 8:45
Thank you, I do need a space between the filename and ci. The second one worked for me @Wiktor — Sajjad Umar
– Sajjad Umar, Commented May 6, 2020 at 9:10
This is the regex I posted, see the answer below, please consider accepting/upvoting. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented May 6, 2020 at 9:13

Wiktor Stribiżew · Accepted Answer · 2020-05-06 08:48:18Z

1

You may use

/\[([^\]\[]*[ _-]ci)\]/i

See the Rubular demo

Details

\[ - a [ char
([^\]\[]*[ _-]ci) - Group 1:
- [^\]\[]* - 0+ chars other than [ and ]
- [ _-] - a space, _ or -
- ci - a ci substring
\] - a ] char.

A Ruby test at IDEONE to extract the first occurrence:

s = '[hello-ci.yml ci] works fine for this [second-DONT-EXTRACT-hello-ci.yml ci]'
puts s[/\[([^\]\[]*[ _-]ci)\]/i, 1] # => hello-ci.yml ci

answered May 6, 2020 at 8:48

Wiktor Stribiżew

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