CODEWITHSUNDEEP
rubyregex
yjrye
yjrye

Reputation: 3

how to match non zero-padded digit in ruby using regexps?

I need a regular expression that match exactly 1-12 and 1-31. 01 is not matched and 65 is not matched. For example "abc 6 abc" is a match, while "abc 65 "is not.

I try this /[1-9]|1[012]/, which does not work.

Upvotes: 0

Views: 90

Answers (2)

hirolau
hirolau

Reputation: 13911

In my opinion this is not a job for a single regexp. Would it not be hard to understand this code when you look back to it in a few years? Why not split it up in two parts?

my_string = 'abc 01 def'
my_string2 = 'abc 8 def'

p  ('1'..'12').include?(my_string[/\d+/])  #=> false
p  ('1'..'12').include?(my_string2[/\d+/]) #=> true

Upvotes: 0

Avinash Raj
Avinash Raj

Reputation: 174706

You need to add word boundaries around your pattern . \b matches between a word character and a non-word character.

For 1-12

/\b(?:1[012]|[1-9])\b/

For 1-31

\b(?:[12]\d|3[01]|[1-9])\b

Upvotes: 1

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