Regular Expressions 101

Pro

1st Alternative^(\d)\1{2}-(\d)\1{1}-(\d)\1{3}$

^start of line

Group 1(\d)

\da digit

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 2(\d)

\da digit

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 3(\d)

\da digit

\1{3}the text saved by group 1, repeated exactly 3 times

$end of line

2nd Alternative^(\d)\1{8}$

^start of line

Group 4(\d)

\da digit

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

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25 tokens

^(\d)\1{2}-(\d)\1{1}-(\d)\1{3}$|^(\d)\1{8}$

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