regex101: PCRE2 (PHP) Match Workspace

Positive Lookahead(?=(?=(?'a'[\s\S]*))(?<!'b'<p\b[^>][\s\S]color[\s\S]:[\s\S]black[^>][\s\S]>[\s\S]<span\b[^>][\s\S]>[\s\S])(?<!<span\b[^>][\s\S]color[\s\S]:[\s\S]black[^>][\s\S]>[\s\S])_(?=\k'a'\z)|(?<=(?=x^|(?<!&b))[\s\S]))

1st Alternative(?=(?'a'[\s\S]*))(?<!'b'<p\b[^>][\s\S]color[\s\S]:[\s\S]black[^>][\s\S]>[\s\S]<span\b[^>][\s\S]>[\s\S])(?<!<span\b[^>][\s\S]color[\s\S]:[\s\S]black[^>][\s\S]>[\s\S])_(?=\k'a'\z)

Positive Lookahead(?=(?'a'[\s\S]*))

Group a(?'a'[\s\S]*)

Character Class[\s\S]*

*matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

Negative Lookbehind(?<!'b'<p\b[^>][\s\S]color[\s\S]:[\s\S]black[^>][\s\S]>[\s\S]<span\b[^>][\s\S]>[\s\S])

'b'<pthe literal text 'b'<p (case sensitive)

\ban ASCII word boundary

Negated Character Class[^>]

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

colorthe literal text color (case sensitive)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

blackthe literal text black (case sensitive)

Negated Character Class[^>]

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

<spanthe literal text <span (case sensitive)

\ban ASCII word boundary

Negated Character Class[^>]

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

Negative Lookbehind(?<!<span\b[^>][\s\S]color[\s\S]:[\s\S]black[^>][\s\S]>[\s\S])

<spanthe literal text <span (case sensitive)

\ban ASCII word boundary

Negated Character Class[^>]

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

colorthe literal text color (case sensitive)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

blackthe literal text black (case sensitive)

Negated Character Class[^>]

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Character Class[\s\S]

\sany whitespace character

\Sany non-whitespace character

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Positive Lookahead(?=\k'a'\z)

\k'a'the text saved by group a

\zend of string

2nd Alternative(?<=(?=x^|(?<!&b))[\s\S])

<codethe literal text <code (case sensitive)

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

style="background-color:the literal text style="background-color: (case sensitive)

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

transparent;">the literal text transparent;"> (case sensitive)

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

25 tokens

Regular Expression

(?=(?=(?'a'[\s\S]*))(?<!'b'<p\b[^>][\s\S]color[\s\S]:[\s\S]black[^>][\s\S]>[\s\S]<span\b[^>][\s\S]>[\s\S])(?<!<span\b[^>][\s\S]color[\s\S]:[\s\S]black[^>][\s\S]>[\s\S])_(?=\k'a'\z)|(?<=(?=x^|(?<!&b))[\s\S]))<code\s*style="background-color:\s*transparent;">

Unit Tests

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