CODEWITHSUNDEEP
regexregex-group
Aneesh Nema
Aneesh Nema

Reputation: 45

Capture optional Group

I want to capture the values of some keys which may be optional, specifically consider the string below

@Foo1:dog|a=5|b=6|c=10|d=12|e=2
@Foo2:cat|a=12|c=10|d=11|e=123
@Foo1:bat|a=213123|b=10
@Foo3:pet|c=346

Now I want to capture the strings between @ and :, : and |, and the value of keys b, d which may be optional. I should the following captured

Foo1, dog, 6, 12
Foo2, cat, 11
Foo1, bat, 10
Foo3, pet

I am using this regex ^@(\w+):(\w+).*(?:b=(\d+)).*(?:d=(\d+)) but it only works when both b and d are present.

Upvotes: 1

Views: 594

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626853

You may use

^@(\w+):(\w+)(?:.*?\|b=(\d+))?(?:.*?\|d=(\d+))?

See the regex demo

Details

  • ^ - start of string
  • @ - a @ char
  • (\w+) - Group 1: one or more word chars
  • : - a colon
  • (\w+) - Group 2: one or more word chars
  • (?:.*?\|b=(\d+))? - an optional non-capturing group matching any 0+ chars other than line break chars, as few as possible, then |b= and then capturing 1+ digits into Group 3
  • (?:.*?\|d=(\d+))? - an optional non-capturing group matching any 0+ chars other than line break chars, as few as possible, then |d= and then capturing 1+ digits into Group 4

Upvotes: 1

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