Regular Expressions 101

"the literal " (34₁₀ / 42₈ / 22₁₆)

Group 1([a-zA-Z]?[a-zA-Z0-9].*)

Character Class[a-zA-Z]?

?matches at most one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

Character Class[a-zA-Z0-9]

a-zone character from a (97₁₀) to z (122₁₀) (case insensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

.*any character (except for line terminators), repeated any number of times

"the literal " (34₁₀ / 42₈ / 22₁₆)

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

Group 2((true|false|null)|([\d].*))

1st Alternative(true|false|null)

Group 3(true|false|null)

1st Alternativetrue

truethe literal text true (case insensitive)

2nd Alternativefalse

falsethe literal text false (case insensitive)

3rd Alternativenull

nullthe literal text null (case insensitive)

2nd Alternative([\d].*)

Group 4([\d].*)

Character Class[\d]

\da digit

.*any character (except for line terminators), repeated any number of times

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

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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Search reference

Regular Expression

"([a-zA-Z]?[a-zA-Z0-9].*)" ?: ?((true|false|null)|([\d].*)),

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