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Regular Expression Details

Title Test Find Validate UK telephone number NSN by initial digits and length (detailed version).
Expression
^(2(?:0[01378]|3[0189]|4[017]|8[0-46-9]|9[012])\d{7}|1(?:(?:1(?:3[0-48]|[46][0-4]|5[012789]|7[0-49]|8[01349])|21[0-7]|31[0-8]|[459]1\d|61[0-46-9]))\d{6}|1(?:2(?:0[024-9]|2[3-9]|3[3-79]|4[1-689]|[58][02-9]|6[0-4789]|7[013-9]|9\d)|3(?:0\d|[25][02-9]|3[02-579]|[468][0-46-9]|7[1235679]|9[24578])|4(?:0[03-9]|2[02-5789]|[37]\d|4[02-69]|5[0-8]|[69][0-79]|8[0-5789])|5(?:0[1235-9]|2[024-9]|3[0145689]|4[02-9]|5[03-9]|6\d|7[0-35-9]|8[0-468]|9[0-5789])|6(?:0[034689]|2[0-689]|[38][013-9]|4[1-467]|5[0-69]|6[13-9]|7[0-8]|9[0124578])|7(?:0[0246-9]|2\d|3[023678]|4[03-9]|5[0-46-9]|6[013-9]|7[0-35-9]|8[024-9]|9[02-9])|8(?:0[35-9]|2[1-5789]|3[02-578]|4[0-578]|5[124-9]|6[2-69]|7\d|8[02-9]|9[02569])|9(?:0[02-589]|2[02-689]|3[1-5789]|4[2-9]|5[0-579]|6[234789]|7[0124578]|8\d|9[2-57]))\d{6}|1(?:2(?:0(?:46[1-4]|87[2-9])|545[1-79]|76(?:2\d|3[1-8]|6[1-6])|9(?:7(?:2[0-4]|3[2-5])|8(?:2[2-8]|7[0-4789]|8[345])))|3(?:638[2-5]|647[23]|8(?:47[04-9]|64[015789]))|4(?:044[1-7]|20(?:2[23]|8\d)|6(?:0(?:30|5[2-57]|6[1-8]|7[2-8])|140)|8(?:052|87[123]))|5(?:24(?:3[2-79]|6\d)|276\d|6(?:26[06-9]|686))|6(?:06(?:4\d|7[4-79])|295[567]|35[34]\d|47(?:24|61)|59(?:5[08]|6[67]|74)|955[0-4])|7(?:26(?:6[13-9]|7[0-7])|442\d|50(?:2[0-3]|[3-68]2|76))|8(?:27[56]\d|37(?:5[2-5]|8[239])|84(?:3[2-58]))|9(?:0(?:0(?:6[1-8]|85)|52\d)|3583|4(?:66[1-8]|9(?:2[01]|81))|63(?:23|3[1-4])|9561))\d{3}|176888[234678]\d{2}|16977[23]\d{3})|7(?:[1-4]\d\d|5(?:0[0-8]|[13-9]\d|2[0-35-9])|624|7(?:0[1-9]|[1-7]\d|8[02-9]|9[0-689])|8(?:[014-9]\d|[23][0-8])|9(?:[04-9]\d|1[02-9]|2[0-35-9]|3[0-689]))\d{6}|76(?:0[012]|2[356]|4[0134]|5[49]|6[0-369]|77|81|9[39])\d{6}|80(?:0(?:1111|\d{6,7})|8\d{7})|500\d{6}|87[123]|9(?:[01]\d|8[0-3]))\d{7}|8(?:4(?:5464\d|[2-5]\d{7})|70\d{7})|70\d{8}|56\d{8}|3[0347]|55)\d{8}$
Description
Step 3: Validate the NSN produced from the pattern in step 2 and check it for length and validity. The pattern here is very detailed matching every valid UK prefix, and rejecting large numbers of non-valid ranges. Step 4 will be to format the number correctly. This needs a variety of RegEx patterns each based on the initial digits and number length as shown in the article mentioned below.
Matches
20 3000 5555, 121 555 7777, 1750 618888, 1750 62555, 19467 55555, 16977 3555, 303 555 7788, 500 777999, 55 4455 7788, 70 7788 5577, 800 555777, 800 444 7799, 845 333 5577, 871 444 5577, 909 555 7788 after removing spaces
Non-Matches
20 444 666, 20 555 7777, 1750 61555, 1999 55777, 1999 555777, 22 5000 7777, 800 55555, 803 555777, 805 555 7777, 845 8888 9999
Author Rating: The rating for this expression. g1smd
Source http://www.aa-asterisk.org.uk/index.php/Regular_Expressions_for_Validating_and_Formatting_GB_Telephone_Numbers
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Existing User Comments

Title: Updated - includes new (0117) 4xx number range in Bristol.
Name: g1smd
Date: 11/12/2012 4:17:17 AM
Comment:
Updated - includes new (0117) 4xx number range in Bristol.


Title: Validate UK telephone numbers in a few simple steps.
Name: g1smd
Date: 10/27/2012 2:13:36 PM
Comment:
See posts 3606 and 3607 for previous steps and post 3608 for a simplified version of this step.


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