Regular Expressions 101

Positive Lookbehind(?<=<div|<a)

1st Alternative<div

<divthe literal text <div (case sensitive)

2nd Alternative<a

<athe literal text <a (case sensitive)

Group 1( *id="[^"]+")

*the literal (32₁₀ / 40₈ / 20₁₆) , repeated any number of times

id="the literal text id=" (case sensitive)

Negated Character Class[^"]+

+matches at least one character outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<=<div|<a)( *id="[^"]+")

New

<p id="keepthis"> text</p><div id="foo">text</div><div id="bar">more text</div><a id="red"href="page6.php">Page 6</a><a id="green"href="page7.php">Page 7</a>

Regular Expression

Substitution