CODEWITHSUNDEEP
regex
user3260341
user3260341

Reputation: 13

Optional regular expression match

I have an string like 1566-02, where -02 is optional. If I use a regular expression like this

1566\s*-\s*\d{2}

it will always expect 2 numeric number with hyphen after 1566.

How I can make the -02 part optional, so that the IsMatch should be true for 1566 also?

For example - The value of IsMatch should be true if we pass the string as 1566 or 1566-02 or 1566-45 IsMatch value should be false for 1566-AC or 1566-

Upvotes: 1

Views: 44

Answers (1)

p.s.w.g
p.s.w.g

Reputation: 149020

Simply wrap it in a group and make it optional with the zero-or-one quantifier (?):

1566(\s*-\s*\d{2})?

To prohibit any other characters before or after the matched string, use start (^) and end ($) anchors:

^1566(\s*-\s*\d{2})?$

Upvotes: 3

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