Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!(?:(\d)\1{8})|(?:(\d)\2{2}-\2{2}-\2{4}))

1st Alternative(?:(\d)\1{8})

Non-Capturing Group(?:(\d)\1{8})

Group 1(\d)

\da digit

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

2nd Alternative(?:(\d)\2{2}-\2{2}-\2{4})

Non-Capturing Group(?:(\d)\2{2}-\2{2}-\2{4})

Group 2(\d)

\da digit

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\2{4}the text saved by group 2, repeated exactly 4 times

.*any character (except for line terminators), repeated any number of 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}-\2{2}-\2{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