regex101: JavaScript Match Workspace

^start of line

Group 1(\/\*\*(?:(?:\S|\s)(?!\*\/))*?(?:\S|\s)?\*\/\s*)?

?repeats the group contents below at most once:

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

Non-Capturing Group(?:(?:\S|\s)(?!\*\/))*?

*?repeats the group contents below any number of times:

Non-Capturing Group(?:\S|\s)

1st Alternative\S

\Sany non-whitespace character

2nd Alternative\s

\sany whitespace character

Negative Lookahead(?!\*\/)

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:\S|\s)?

?repeats the group contents below at most once:

1st Alternative\S

\Sany non-whitespace character

2nd Alternative\s

\sany whitespace character

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\s*any whitespace character, repeated any number of times

Group 2((?:(?:const|var|let).*{.*})?[^}\n]*(?:$.*$.*{))

Non-Capturing Group(?:(?:const|var|let).*{.*})?

?repeats the group contents below at most once:

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

1st Alternativeconst

constthe literal text const (case insensitive)

2nd Alternativevar

varthe literal text var (case insensitive)

3rd Alternativelet

letthe literal text let (case insensitive)

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

{the literal { (123₁₀ / 173₈ / 7B₁₆)

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

}the literal } (125₁₀ / 175₈ / 7D₁₆)

Negated Character Class[^}\n]*

*matches any number of characters outside the set below:

}the literal } (125₁₀ / 175₈ / 7D₁₆)

\na line-feed (newline) character (ASCII 10)

Non-Capturing Group(?:$.*$.*{)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

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

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

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

{the literal { (123₁₀ / 173₈ / 7B₁₆)

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|\s)(?!\*\/))*?(?:\S|\s)?\*\/\s*)?((?:(?:const|var|let).*{.*})?[^}\n]*(?:\(.*\).*{))

Unit Tests

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