Regular Expressions 101

Pro

Group 1(1 ){0,}

{0,}repeats the group contents below any number of times:

1 the literal text 1

Group 2(\d |\d\d )

1st Alternative\d

\da digit

the literal (32₁₀ / 40₈ / 20₁₆)

2nd Alternative\d\d

\da digit

the literal (32₁₀ / 40₈ / 20₁₆)

\2{1,}the text saved by group 2, repeated at least once

Group 3(1 ){0,}

{0,}repeats the group contents below any number of times:

1 the literal text 1

\2{1,}the text saved by group 2, repeated at least once

Group 4(1 ){0,}

{0,}repeats the group contents below any number of times:

1 the literal text 1

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

(1 ){0,}(\d |\d\d )\2{1,}(1 ){0,}\2{1,}(1 ){0,}

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