regex101: PCRE (Legacy) Substitution Workspace

<tag>the literal text <tag> (case sensitive)

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

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

Negative Lookahead(?!<!CDATA\[[^\n\]]*\]>(?:[^>]|$))

<!CDATAthe literal text <!CDATA (case sensitive)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

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 > (62₁₀ / 76₈ / 3E₁₆)

Non-Capturing Group(?:[^>]|$)

1st Alternative[^>]

Negated Character Class[^>]

>the literal > (62₁₀ / 76₈ / 3E₁₆)

2nd Alternative$

$end of line

Group 1((?:<!|!<)CDATA\[.*?\]+>+)

Non-Capturing Group(?:<!|!<)

1st Alternative<!

<!the literal text <!

2nd Alternative!<

!<the literal text !<

CDATAthe literal text CDATA (case sensitive)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

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

\]+the literal ] (93₁₀ / 135₈ / 5D₁₆) , repeated at least once

>+the literal > (62₁₀ / 76₈ / 3E₁₆) , repeated at least once

Positive Lookahead(?=.*<\/tag>)

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

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

tag>the literal text tag> (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

Search reference

Regular Expression

<tag>.*?\K(?!<!CDATA\[[^\n\]]*\]>(?:[^>]|$))((?:<!|!<)CDATA\[.*?\]+>+)(?=.*<\/tag>)

Test String
New

<tag>data...<!CDATA[...]]>...otherdata..!<CDATA[....]>>....</tag>

<tag>data......otherdata..!<CDATA[....]>>....</tag>

<tag>data...!<CDATA[|]]>...otherdata......</tag>

<tag>data...<!CDATA[asdfghjkl]>...otherdata......</tag>




<tag>data...<!CDATA[...]]>...otherdata..!<CDATA[....]>>....

data...<!CDATA[...]]>...otherdata..!<CDATA[....]>>....</tag>

<tag2>data...<!CDATA[...]]>...otherdata..!<CDATA[....]>>....</tag2>

Regular Expressions 101

Regular Expression

Test String
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Substitution
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Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
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Substitution
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