Regular Expressions 101

Pro

Negative Lookahead(?!.+(\bgoogle.com\b))

.+any character (except for line terminators), repeated at least once

Group 1(\bgoogle.com\b)

\ban ASCII word boundary

googlethe literal text google (case sensitive)

.any character (except for line terminators)

comthe literal text com (case sensitive)

\ban ASCII word boundary

Group 2(<a[^>]+href=")

<athe literal text <a (case sensitive)

Negated Character Class[^>]+

+matches at least one character outside the set below:

>the literal > (62₁₀ / 76₈ / 3E₁₆)

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

Group 3(http|https)

1st Alternativehttp

httpthe literal text http (case sensitive)

2nd Alternativehttps

httpsthe literal text https (case sensitive)

Group 4([^>" ]+)

Negated Character Class[^>" ]+

+matches at least one character outside the set below:

>the literal > (62₁₀ / 76₈ / 3E₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Group 5("?[^>]*>)

"?optionally matches the literal " (34₁₀ / 42₈ / 22₁₆)

Negated Character Class[^>]*

*matches any number of characters outside the set below:

>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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(?!.+(\bgoogle.com\b))(<a[^>]+href=")(http|https)([^>" ]+)("?[^>]*>)

New

<a href="http://www.google.com">google</a>
<a href="http://www.exmple.com">example</a>
<a href="http://www.google.com">google</a>
<a href="http://www.exmple.com">example</a>

Substitution

<a href="http://www.google.com">google</a>
<a href="http://www.exmple.com">example</a>
<a href="http://www.google.com">google</a>
<a href="http://www.exmple.com">example</a>