Regular Expressions 101

1st Alternative(?<=>)\s*([^<]*[^\s<])\s*(?=<)

Positive Lookbehind(?<=>)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

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

Group 1([^<]*[^\s<])

Negated Character Class[^<]*

*matches any number of characters outside the set below:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Negated Character Class[^\s<]

\sany whitespace character

<the literal < (60₁₀ / 74₈ / 3C₁₆)

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

Positive Lookahead(?=<)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

2nd Alternative(?<=>)\s*

Positive Lookbehind(?<=>)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<=>)\s*([^<]*[^\s<])\s*(?=<)|(?<=>)\s*

New

<?xml version="1.0" encoding="UTF-8"?>
<note>
    <to>Tove</to>
    <from>Jani</from>
    <heading> * + Reminder + * </heading>
    <body>Don't forget
        me this weekend!        
    </body>
</note>

Substitution

$1