I used the following regular expression to test for US phone numbers.
Note that it may not cover all cases; I will display some of the cases I was testing for below. Feel free to use the expression as a starting point and make modifications to meet your requirements.
/^\+?1?[-. ]?\(?([2-9][0-9]{2})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/ These are some variations that are matched by the regular expression:
4141234567
414.123.4567
414-123-4567
414 123 4567
(414) 123-4567
1 (414) 123.4567
+1 414 123 4567You can use a site like this to verify the matches. Make sure to update the regex options to use the "global" and "multi line" flags.
| Section | Explanation |
|---|---|
/^ | Signifies the beginning of a line |
\+? | Matches the + character zero or more times (? allows the character to be nonexistent) |
1? | Matches the 1 character zero or more times |
[-. ]? | Matches one of the -, ., or space characters zero or more times ([] signifies a set where one any of the characters can be matched) |
\(? | Matches the ( character zero or more times |
[2-9] | Matches a single character between 2 and 9 |
[0-9]{2} | Matches two consecutive characters between 0 and 9 |
\)? | Matches the ) character zero or more times |
[-. ]? | Matches one of the -, ., or space characters zero or more times |
([0-9]{3}) | Matches three consecutive characters between 0 and 9 |
[-. ]? | Matches one of the -, ., or space characters zero or more times |
([0-9]{4}) | Matches four consecutive characters between 0 and 9 |
$/ | Signifies the end of a line |
While regular expressions are usually language-independent, I did use it in JavaScript. I utilized the RegExp.test() method to determine if there was a match between the regualr expression and a string.