Regular Expressions 101

Pro

Group 1(<a\s+href="http:(?!\/\/(?:www\.)?example\.com)[^"]*")

<athe literal text <a (case insensitive)

\s+any whitespace character, repeated at least once

href="http:the literal text href="http: (case insensitive)

Negative Lookahead(?!\/\/(?:www\.)?example\.com)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:www\.)?

?repeats the group contents below at most once:

wwwthe literal text www (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

examplethe literal text example (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case insensitive)

Negated Character Class[^"]*

*matches any number of characters outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Global pattern flags

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

s modifier: single line. Allows a dot to match line terminators

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

Detailed match information will be displayed here automatically.

25 tokens

(<a\s+href="http:(?!\/\/(?:www\.)?example\.com)[^"]*")>

New

<a href="/somepage.htm">1</a>
<a href="http://www.somesiteexternal.com/">2</a>
<a href="http://www.example.com/somepage.htm">3</a>

\1 target="_blank">

<a href="/somepage.htm">1</a>
<a href="http://www.somesiteexternal.com/">2</a>
<a href="http://www.example.com/somepage.htm">3</a>