Regular Expressions 101

Pro

Positive Lookbehind(?<=(?:const\s|var\s|let\s)[^;\n]*)

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

1st Alternativeconst\s

constthe literal text const (case sensitive)

\sany whitespace character

2nd Alternativevar\s

varthe literal text var (case sensitive)

\sany whitespace character

3rd Alternativelet\s

letthe literal text let (case sensitive)

\sany whitespace character

Negated Character Class[^;\n]*

*matches any number of characters outside the set below:

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

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

Positive Lookahead(?=const|var|let)

1st Alternativeconst

constthe literal text const (case sensitive)

2nd Alternativevar

varthe literal text var (case sensitive)

3rd Alternativelet

letthe literal text let (case sensitive)

Global pattern flags

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

Ready to run

26 tokens

(?<=(?:const\s|var\s|let\s)[^;\n]*)(?=const|var|let)