regex101: UK TEL

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Group 1((^\+44)|^(4{2})|(^0{2}4{2})|(^0)|)

1st Alternative(^\+44)

Group 2(^\+44)

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\+the literal + (43₁₀ / 53₈ / 2B₁₆)

44the literal text 44

2nd Alternative^(4{2})

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Group 3(4{2})

4{2}the literal 4 (52₁₀ / 64₈ / 34₁₆) , repeated exactly 2 times

3rd Alternative(^0{2}4{2})

Group 4(^0{2}4{2})

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0{2}the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated exactly 2 times

4{2}the literal 4 (52₁₀ / 64₈ / 34₁₆) , repeated exactly 2 times

4th Alternative(^0)

Group 5(^0)

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0the literal 0 (48₁₀ / 60₈ / 30₁₆)

5th Alternative — matches an empty string

Group 6([123789])

Character Class[123789]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

7the literal 7 (55₁₀ / 67₈ / 37₁₆)

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

\d{8,9}a digit, repeated between 8 and 9 times

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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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Search reference

Regular Expression

^((^\+44)|^(4{2})|(^0{2}4{2})|(^0)|)([123789])\d{8,9}$

New

+44123456789
+441234567890
+44123456789
+441234567890
+447921040642
+441234567890
+44123456789
+44123456789
+441234567890
+44123456789
441234567890
44123456789
441234567890
447921040642
441234567890
44123456789
44123456789
441234567890
07921040642
0123456789
01234567890
0123456789
01234567890
01932867083
00441234567
0845121212
0044123456789
00441234567890
0123456789
01234567890
0123456789
01234567890
01932867083
00441234567
0044123456789
00441234567890
0044123456789
00441234567890
08006444454
4451925858
01420383091 
112222222
111111111

Regular Expressions 101

Regular Expression

Substitution