Regular Expressions 101

Explanation

Pro

\$the literal $ (36₁₀ / 44₈ / 24₁₆)

\w+any word character, repeated at least once

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

Branch Reset Group(?|\h*(\[)\h*('[^']+')\h*|(\h*\[)\h*("[^"]+")\h*)

1st Alternative\h*(\[)\h*('[^']+')\h*

\h*any horizontal whitespace character, repeated any number of times

Group 1(\[)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\h*any horizontal whitespace character, repeated any number of times

Group 2('[^']+')

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Negated Character Class[^']+

+matches at least one character outside the set below:

'the literal ' (39₁₀ / 47₈ / 27₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

\h*any horizontal whitespace character, repeated any number of times

2nd Alternative(\h*\[)\h*("[^"]+")\h*

Group 1(\h*\[)

\h*any horizontal whitespace character, repeated any number of times

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\h*any horizontal whitespace character, repeated any number of times

Group 2("[^"]+")

"the literal " (34₁₀ / 42₈ / 22₁₆)

Negated Character Class[^"]+

+matches at least one character outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

\h*any horizontal whitespace character, repeated any number of times

Positive Lookahead(?=])

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

\$\w+\K(?|\h*(\[)\h*('[^']+')\h*|(\h*\[)\h*("[^"]+")\h*)(?=])

New

$foo [ "bar" ], $foo ["bar" ], $foo [ "bar"]
$foo [ 'bar' ], $foo ['bar' ], $foo [ 'bar']
$foo [ 'this is different' ]

Substitution

$1$2

$foo [ "bar" ], $foo ["bar" ], $foo [ "bar"]
$foo [ 'bar' ], $foo ['bar' ], $foo [ 'bar']
$foo [ 'this is different' ]