regex101: PCRE (Legacy) Match Workspace

1st Alternative(?<Test><(?<Node>\S+)(>\s*<\/\k<Node>>|\s*\/>))

Group Test(?<Test><(?<Node>\S+)(>\s*<\/\k<Node>>|\s*\/>))

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Group Node(?<Node>\S+)

\S+any non-whitespace character, repeated at least once

Group 3(>\s*<\/\k<Node>>|\s*\/>)

1st Alternative>\s*<\/\k<Node>>

>the literal > (62₁₀ / 76₈ / 3E₁₆)

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

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\k<Node>the text saved by group Node

>the literal > (62₁₀ / 76₈ / 3E₁₆)

2nd Alternative\s*\/>

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

2nd Alternative(?<test2><(?<Outer>\S+)>\s+((?&Test)|(?&test2)* )\s+<\/\k<Outer>>)

Group test2(?<test2><(?<Outer>\S+)>\s+((?&Test)|(?&test2)* )\s+<\/\k<Outer>>)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Group Outer(?<Outer>\S+)

\S+any non-whitespace character, repeated at least once

>the literal > (62₁₀ / 76₈ / 3E₁₆)

\s+any whitespace character, repeated at least once

Group 6((?&Test)|(?&test2)* )

1st Alternative(?&Test)

(?&Test)calls group Test as a subroutine

2nd Alternative(?&test2)*

(?&test2)*calls group test2 as a subroutine, repeated any number of times

\s+any whitespace character, repeated at least once

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\k<Outer>the text saved by group Outer

>the literal > (62₁₀ / 76₈ / 3E₁₆)

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Search reference

Regular Expression

(?<Test><(?<Node>\S+)(>\s*<\/\k<Node>>|\s*\/>))|(?<test2><(?<Outer>\S+)>\s+((?&Test)|(?&test2)*
)\s+<\/\k<Outer>>)

New

<root>
<tag1>Good</tag1>
<tag2 element="Good"></tag2>
<tag3 element="Good" />
<tag4></tag4>
<tag13>
</tag13>
<tag5 />
<tag6/>
<tag7>
	<tag7.1>good</tag7.1>
</tag7>
<tag8>
	<tag8.1></tag8.1>
</tag8>
<tag9>
	<tag9.1 />
</tag9>
<tag10>
	<tag10.1/>
</tag10>
<tag10>
	<tag10.1>Wel iets</tag10.1>
</tag10>
<tag11>
	<tag11.1 element="Good"/>
</tag11>
<tag12>
	<tag12.1></tag12.1>
	<tag12.2>
		<tag12.2.1></tag12.2.1>
	</tag12.2>
</tag12>
</root>