Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!(\d)\1{8}$)

Group 1(\d)

\da digit

\1{8}the text saved by group 1, repeated exactly 8 times

$end of line

Negative Lookahead(?!(\d)\2\2-(\d)\2-(\d)\2{3}$)

Group 2(\d)

\da digit

\2the text saved by group 2

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 3(\d)

\da digit

\2the text saved by group 2

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 4(\d)

\da digit

\2{3}the text saved by group 2, repeated exactly 3 times

$end of line

Negative Lookahead(?!000|666|9\d\d)

1st Alternative000

000the literal text 000

2nd Alternative666

666the literal text 666

3rd Alternative9\d\d

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

\da digit

\d{3}a digit, repeated exactly 3 times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookahead(?!00)

00the literal text 00

\da digit

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookahead(?!0000)

0000the literal text 0000

\d{4}a digit, repeated exactly 4 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.

25 tokens

^(?!(\d)\1{8}$)(?!(\d)\2\2-(\d)\2-(\d)\2{3}$)(?!000|666|9\d\d)\d{3}-(?!00)\d\d-(?!0000)\d{4}$

New

888888888
123456789
888-88-8888
123-45-6789
111-22-3333
333-33-3333

888888888
123456789
888-88-8888
123-45-6789
111-22-3333
333-33-3333