Regular Expressions 101

Positive Lookbehind(?<=\<a.*?www\.)

\<the literal < (60₁₀ / 74₈ / 3C₁₆)

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

.*?any character (except for line terminators), repeated any number of times

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 1([a-z]+\.[a-z]+)

Character Class[a-z]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

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

(?<=\<a.*?www\.)([a-z]+\.[a-z]+)

New

<a href="https://www.domainurl.com/refer/google-adsense/">fsdf</a>
<a title="Google Adsense" href="https://www.domainurl.com/refer/google-adsense/" target="_blank" rel="nofollow noopener">fgddf</a>
<a href="https://www.domainurl.com/page/pago">domain </a>

Substitution

&$1;