Regular Expressions 101

Explanation

Pro

Group 1(\S[^\S\n]*\n)

\Sany non-whitespace character

Negated Character Class[^\S\n]*

*matches any number of characters outside the set below:

\Sany non-whitespace character

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

Negated Character Class[^\S\n]*

*matches any number of characters outside the set below:

\Sany non-whitespace character

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

Negative Lookahead(?![^\S\n]*\n)

Negated Character Class[^\S\n]*

*matches any number of characters outside the set below:

\Sany non-whitespace character

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

Global pattern flags

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(\S[^\S\n]*\n)[^\S\n]*\n(?![^\S\n]*\n)

New



<nav>
            
   <ul>

    <li><a href="#">London</a></li>

    <li><a href="#">Paris</a></li>

    <li><a href="#">Tokyo</a></li>

  </ul>

</nav>



<div>new context</div>



<div>new context</div>

Substitution

$1



<nav>
            
   <ul>

    <li><a href="#">London</a></li>

    <li><a href="#">Paris</a></li>

    <li><a href="#">Tokyo</a></li>

  </ul>

</nav>



<div>new context</div>



<div>new context</div>