Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!\d{0,7}(\d)\1{2})

\d{0,7}a digit, repeated between 0 and 7 times

Group 1(\d)

\da digit

\1{2}the text saved by group 1, repeated exactly 2 times

\d{1,30}a digit, repeated between 1 and 30 times

$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.

27 tokens

^(?!\d{0,7}(\d)\1{2})\d{1,30}$

New

1234567
1234456
1234445
12345678904444

1234567890
11234567890
11134567890
12345666890

81234567890
811234567890
811134567890
12345666890

1234567
1234456
1234445
12345678904444

1234567890
11234567890
11134567890
12345666890

81234567890
811234567890
811134567890
12345666890