c# regex spain mobile phone

Question

what would be a valid regex for these rules:

34 6xx xxx xxx 
34 7yx xxx xxx
(note y cannot be 0 (zero))

would this one work?

34(([6][0-9]{8}$)|([7][1-9]{1}[0-9]{7}$))

Answer 1

Your regular expression should work, assuming that you are not expecting it to handle spaces.

You can further optimize your regex by extracting the common suffix of [0-9]{7} from it:

^34(?:6[0-9]|7[1-9])[0-9]{7}$

If you would like to account for optional spaces, insert \s? into your regex in places where you wish to allow space characters to be inserted:

^34\s?(?:6[0-9]|7[1-9])[0-9]\s?[0-9]{3}\s?[0-9]{3}$

Answer 2

If you need to handle this specific format with spaces, you can use

^34 ?(?:6[0-9]{2}|7[1-9][0-9])(?: ?[0-9]{3}){2}$

See RegexStorm demo

REGEX EXPLANATION:

• ^ - Start of string
• 34 ? - 34 followed by an optional space
• (?:6[0-9]{2}|7[1-9][0-9]) - A group of 2 alternatives: 6 can be followed by any 2 digits, and 7 can be followed only by non-0 and one more digit
• (?: ?[0-9]{3}){2} - 2 groups of 3 digits, optionally separated with a space
• $ - End of string.