Regular Expressions 101

1st Alternative^(\+){0,1}(254){0,1}(70|71|72|79)(\d{7})

^start of line

Group 1(\+){0,1}

{0,1}repeats the group contents below at most once:

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

Group 2(254){0,1}

{0,1}repeats the group contents below at most once:

254the literal text 254

Group 3(70|71|72|79)

1st Alternative70

70the literal text 70

2nd Alternative71

71the literal text 71

3rd Alternative72

72the literal text 72

4th Alternative79

79the literal text 79

Group 4(\d{7})

\d{7}a digit, repeated exactly 7 times

2nd Alternative(254){0,3}(740|741|742|743|745|746|748|757|758|759|768|769|110|111)(\d{6})$

Group 5(254){0,3}

{0,3}repeats the group contents below between 0 and 3 times:

254the literal text 254

Group 6(740|741|742|743|745|746|748|757|758|759|768|769|110|111)

1st Alternative740

740the literal text 740

2nd Alternative741

741the literal text 741

3rd Alternative742

742the literal text 742

4th Alternative743

743the literal text 743

5th Alternative745

745the literal text 745

6th Alternative746

746the literal text 746

7th Alternative748

748the literal text 748

8th Alternative757

757the literal text 757

9th Alternative758

758the literal text 758

10th Alternative759

759the literal text 759

11th Alternative768

768the literal text 768

12th Alternative769

769the literal text 769

13th Alternative110

110the literal text 110

14th Alternative111

Group 7(\d{6})

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(\+){0,1}(254){0,1}(70|71|72|79)(\d{7})|(254){0,3}(740|741|742|743|745|746|748|757|758|759|768|769|110|111)(\d{6})$

Test String
New

VALID NUMBERS
254715228228
254722228228
254729228228
254745229228
254769229228
254110229228
254111229228

INVALID NUMBERS
254730229228
254744229228
254747229228
254760229228
254100229228


Sources: https://ca.go.ke/wp-content/uploads/2020/01/Telecommunication-Numbering-Plan-for-Kenya-Feb-2020-compressed.pdf

Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
Processing...