regex101: PCRE (Legacy) Match Workspace

Positive Lookbehind(?<=[:=!?&,;|{\[\(\n])

Character Class[:=!?&,;|{\[\(\n]

:the literal : (58₁₀ / 72₈ / 3A₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

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

Character Class[\x09\x20]*

*matches any number of characters from the set below:

\x09the literal (9₁₆ / 11₈ / 9₁₀)

\x20the literal (20₁₆ / 40₈ / 32₁₀)

Non-Capturing Group(?:\/(?![*+?])(?:(?:[^\n\[\\\/]*+(?:\\\\)*+(?:\\\[|\\\/|\\(?!\[))?(\[)?)+(?(1)([^\n\]\\]*+(\\\\)*+(\\\]|\\(?!\]))?)*((?<!\\)\])?))*[^\n]*?(?<![^\\]\/)(?<![^\\]\\)\/)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Negative Lookahead(?![*+?])

Character Class[*+?]

*the literal * (42₁₀ / 52₈ / 2A₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

Non-Capturing Group(?:(?:[^\n\[\\\/]*+(?:\\\\)*+(?:\\\[|\\\/|\\(?!\[))?(\[)?)+(?(1)([^\n\]\\]*+(\\\\)*+(\\\]|\\(?!\]))?)*((?<!\\)\])?))*

*repeats the group contents below any number of times:

Non-Capturing Group(?:[^\n\[\\\/]*+(?:\\\\)*+(?:\\\[|\\\/|\\(?!\[))?(\[)?)+

+repeats the group contents below at least once:

Negated Character Class[^\n\[\\\/]*+

*+matches any number of characters outside the set below:

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

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:\\\\)*+

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

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Non-Capturing Group(?:\\\[|\\\/|\\(?!\[))?

?repeats the group contents below at most once:

1st Alternative\\\[

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

2nd Alternative\\\/

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

3rd Alternative\\(?!\[)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Negative Lookahead(?!\[)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group 1(\[)?

?repeats the group contents below at most once:

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Condition(?(1)([^\n\]\\]*+(\\\\)*+(\\\]|\\(?!\]))?)*((?<!\\)\])?)

Uses the first branch if group 1 matched

If the condition is true, match this branch:([^\n\]\\]*+(\\\\)*+(\\\]|\\(?!\]))?)*((?<!\\)\])?

Group 2([^\n\]\\]*+(\\\\)*+(\\\]|\\(?!\]))?)*

*repeats the group contents below any number of times:

Negated Character Class[^\n\]\\]*+

*+matches any number of characters outside the set below:

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

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Group 3(\\\\)*+

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

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Group 4(\\\]|\\(?!\]))?

?repeats the group contents below at most once:

1st Alternative\\\]

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

2nd Alternative\\(?!\])

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Negative Lookahead(?!\])

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Group 5((?<!\\)\])?

Negated Character Class[^\n]*?

Negative Lookbehind(?<![^\\]\/)

Negative Lookbehind(?<![^\\]\\)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Character Class[gim]{0,3}

Character Class[\x09\x20]*+

Negative Lookahead(?![^}\]\),;:.\n])

Global pattern flags

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

Search reference

Regular Expression

(?<=[:=!?&,;|{\[\(\n])[\x09\x20]*(?:\/(?![*+?])(?:(?:[^\n\[\\\/]*+(?:\\\\)*+(?:\\\[|\\\/|\\(?!\[))?(\[)?)+(?(1)([^\n\]\\]*+(\\\\)*+(\\\]|\\(?!\]))?)*((?<!\\)\])?))*[^\n]*?(?<![^\\]\/)(?<![^\\]\\)\/)[gim]{0,3}[\x09\x20]*+(?![^}\]\),;:.\n])

Unit Tests

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