Regular expression for phone numbers

Question

I'm trying:

\d{3}|\d{11}|\d{11}-\d{1}

to match three-digit numbers, eleven-digit numbers, eleven-digit followed by a hyphen, followed by one digit. But, it only matches three digit numbers!

I also tried \d{3}|\d{11}|\d{11}-\d{1} but doesn't work.

Any ideas?

There are many topics on using regular expressions to match phone numbers: http://stackoverflow.com/search?q=regex+phone+number — Mansoor Siddiqui, Feb 01 '11 at 21:50
possible duplicate of [Regular Expression for matching a phone number](http://stackoverflow.com/questions/4395058/regular-expression-for-matching-a-phone-number) — Mark Thomas, Feb 01 '11 at 22:46

score 1 · Answer 1 · answered Feb 01 '11 at 21:49

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There are many ways of punctuating phone numbers. Why don't you remove everything but the digits and check the length?

Note that there are several ways of indicating "extension":

+1 212 555 1212 ext.35

answered Feb 01 '11 at 21:49

egrunin

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because i just want use regular expression – r.zarei Feb 01 '11 at 21:52
Check the length for what, precisely? – tchrist Feb 01 '11 at 22:27

Anon. · Accepted Answer · 2011-02-02T01:07:38.727

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If the first part of an alternation matches, then the regex engine doesn't even try the second part.

Presuming you want to match only three-digit, 11 digit, or 11 digit hyphen 1 digit numbers, then you can use lookarounds to ensure that the preceding and following characters aren't digits.

(?<!\d)(\d{3}|\d{11}|\d{11}-\d{1})(?!\d)

edited Feb 02 '11 at 01:07

answered Feb 01 '11 at 21:49

Anon.

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hi Anon. According your saying, i used \d{11}-\d{1}|\d{11}|\d{3} and it worked. tanks. – r.zarei Feb 01 '11 at 22:02
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Did you mean (?<!\d) and (?!\d) for the anchors? – Feb 01 '11 at 23:42

score 0 · Answer 3 · answered Feb 01 '11 at 22:00

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\d{7}+\d{4} will select an eleven digit number. I could not get \d{11} to actually work.

answered Feb 01 '11 at 22:00

Cloudkiller

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In addition to matching an eleven digit number, `\d{7}+\d{4}` will also match 18, 25, 32, 39 etc. digit numbers. – Anon. Feb 01 '11 at 22:04

score 0 · Answer 4 · 2011-02-01T23:05:03.460

This should work: /(?:^|(?<=\D))(\d{3}|\d{11}|\d{11}-\d{1})(?:$|(?=\D))/
or combined /(?:^|(?<!\d))(\d{3}|\d{11}(?:-\d{1})?)(?:$|(?![\d-]))/

expanded:

/ (?:^ | (?<!\d))       # either start of string or not a digit before us
  (                     # capture grp 1
      \d{3}                 # a 3 digit number
    |                     # or
      \d{11}                # a 11 digit number
      (?:-\d{1})?           # optional '-' pluss 1 digit number
  )                     # end capture grp 1
  (?:$ | (?![\d-]))     # either end of string or not a digit nor '-' after us
/

Regular expression for phone numbers

4 Answers4

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