I'm trying to see if a string matches my country's phone number format, which is the area code (two digits that may or may not be preceded by a 0 and might also be between parenthesis) followed by 8 or 9 digits in which there may be an dash character before the 4 last digits. These are some valid formats:
'00 00000000'
'000-000000000'
'000 00000-0000'
'00 0000-0000'
'(00) 0000-0000'
'(000) 000000000'
So far this is the working expression I have:
p = /0?\d{2}\s?-?\s?\d{4,5}\s?-?\s?\d{4}/
I tried to use a conditional to see if the area code is inside parenthesis with /?(\() 0?\d{2}\)|0?\d{2} \s?-?\s?\d{4,5}\s?-?\s?\d{4}/ but got the (repl):1: target of repeat operator is not specified: /?(\() 0?\d{2}\)|0?\d{2} \s?-?\s?\d{4,5}\s?-?\s?\d{4} error.
What am I doing wrong here?
I believe you can use the following regular expression.
R = /
\A # match beginning of string
(?: # begin a non-capture group
\(0?\d{2}\) # match '(' then an optional `0` then two digits then ')'
| # or
0?\d{2} # match an optional `0` then two digits
) # end the non-capture group
(?: # begin a non-capture group
[ ]+ # match one or more spaces
| # or
- # match a hyphen
) # end the non-capture group
\d{4,5} # match 4 or 5 digits
-? # optionally match a hyphen
\d{4} # match 4 digits
\z # match end of string
/x # free-spacing regex definition mode
arr = [
'00 00000000',
'000-000000000',
'000 00000-0000',
'00 0000-0000',
'(00) 0000-0000',
'(000) 000000000',
'(000 000000000',
'(0000) 000000000'
]
arr.map { |s| s.match? R }
#=> [true, true, true, true, true, true, false, false]
The regex is conventionally written as follows.
R = /\A(?:\(0?\d{2}\)|0?\d{2})(?: +|-)\d{4,5}-?\d{4}\z/
This should be changed as follows if the leading digits cannot equal zero. (If, for example, '001-123456789' and '(12)-023456789' are invalid.)
R = /\A(?:\(0?[1-9]\d\)|0?\[1-9]\d)(?: +|-)[1-9]\d{3,4}-?\d{4}\z/