regex101: JavaScript Match Workspace

^start of line

Non-Capturing Group(?:[\s]+)?

?repeats the group contents below at most once:

Character Class[\s]+

+matches at least one character from the set below:

\sany whitespace character

Non-Capturing Group(?:const|let|var|)?

?repeats the group contents below at most once:

1st Alternativeconst

constthe literal text const (case insensitive)

2nd Alternativelet

letthe literal text let (case insensitive)

3rd Alternativevar

varthe literal text var (case insensitive)

4th Alternative — matches an empty string

Non-Capturing Group(?:[a-z0-9.]+(?:\.prototype)?)?

?repeats the group contents below at most once:

Character Class[a-z0-9.]+

+matches at least one character from the set below:

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

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

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:\.prototype)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

prototypethe literal text prototype (case insensitive)

Non-Capturing Group(?:\s)?

?repeats the group contents below at most once:

\sany whitespace character

Non-Capturing Group(?:[a-z0-9-_{}:\s]+\s?=)?

?repeats the group contents below at most once:

Character Class[a-z0-9-_{}:\s]+

+matches at least one character from the set below:

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\sany whitespace character

\s?optionally matches any whitespace character

=the literal = (61₁₀ / 75₈ / 3D₁₆)

\s?optionally matches any whitespace character

Non-Capturing Group(?:[a-z0-9]+\s+\:\s+)?

?repeats the group contents below at most once:

Character Class[a-z0-9]+

+matches at least one character from the set below:

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

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

\s+any whitespace character, repeated at least once

\:the literal : (58₁₀ / 72₈ / 3A₁₆)

\s+any whitespace character, repeated at least once

Non-Capturing Group(?:function\s?)?

?repeats the group contents below at most once:

functionthe literal text function (case insensitive)

\s?optionally matches any whitespace character

Non-Capturing Group(?:[a-z0-9_-]+)?

?repeats the group contents below at most once:

Character Class[a-z0-9_-]+

+matches at least one character from the set below:

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

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\s?optionally matches any whitespace character

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

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

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\s?optionally matches any whitespace character

Non-Capturing Group(?:.+)?

?repeats the group contents below at most once:

.+any character (except for line terminators), repeated at least once

Group 1([=>]:)?

?repeats the group contents below at most once:

Character Class[=>]

=the literal = (61₁₀ / 75₈ / 3D₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\{the literal { (123₁₀ / 173₈ / 7B₁₆)

Non-Capturing Group(?:(?:[^}{]+|\{(?:[^}{]+|\{[^}{]*\})*\})*\}(?:\s?$.*$\s?\)\s?)?)?

?repeats the group contents below at most once:

Non-Capturing Group(?:[^}{]+|\{(?:[^}{]+|\{[^}{]*\})*\})*

*repeats the group contents below any number of times:

1st Alternative[^}{]+

Negated Character Class[^}{]+

+matches at least one character outside the set below:

}the literal } (125₁₀ / 175₈ / 7D₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

2nd Alternative\{(?:[^}{]+|\{[^}{]*\})*\}

\{the literal { (123₁₀ / 173₈ / 7B₁₆)

Non-Capturing Group(?:[^}{]+|\{[^}{]*\})*

\}the literal } (125₁₀ / 175₈ / 7D₁₆)

Non-Capturing Group(?:\s?$.*$\s?\)\s?)?

Non-Capturing Group(?:\;)?

$end of line

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

Search reference

Regular Expression

^(?:[\s]+)?(?:const|let|var|)?(?:[a-z0-9.]+(?:\.prototype)?)?(?:\s)?(?:[a-z0-9-_{}:\s]+\s?=)?\s?(?:[a-z0-9]+\s+\:\s+)?(?:function\s?)?(?:[a-z0-9_-]+)?\s?\(.*\)\s?(?:.+)?([=>]:)?\{(?:(?:[^}{]+|\{(?:[^}{]+|\{[^}{]*\})*\})*\}(?:\s?\(.*\)\s?\)\s?)?)?(?:\;)?$

Unit Tests

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