CODEWITHSUNDEEP
regex
Frizz
Frizz

Reputation: 2544

Regex with 3 substrings

I am looking for a regex to match the following strings:

node-primary-backup-2017-08-10-15
node-secondary-backup-2017-06-12-32
node-secondary-backup-2017-08-11-24
node-primary-backup-2017-07-13-02
...

I tried the following, but it's not working:

node-(?=primary|secondary)-backup-\d+-\d+-\d+-\d+

Any help is appreciated!

Upvotes: 2

Views: 49

Answers (1)

Bohemian
Bohemian

Reputation: 424983

The expression (?=primary|secondary) is a look ahead, which asserts that the characters immediately following the current position match the specified expression, but it does not consume any input.

Your expression requires that -backup-\d+-\d+-\d+-\d+ matches (primary|secondary), which of course is impossible.

Just remove ?= to make it a simple alternation expression:

node-(primary|secondary)-backup-\d+-\d+-\d+-\d+

Upvotes: 3

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