regex101: PCRE (Legacy) Match Workspace

Pro

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

Negative Lookahead(?!https?:\/\/)

httpthe literal text http (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Group 1() — does not consume characters

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

25 tokens

Regular Expression

href="(?!https?:\/\/)()[^"]+"

New

<p> We love 
    <a href="https://google.com" rel="noopener noreferrer" target="_blank">Google</a> 
    and 
    <a href="Facebook.com" rel="noopener noreferrer" target="_blank">Facebook</a>. 
    <a href="www.example.com" rel="noopener noreferrer" target="_blank">Facebook</a>. 
    <a href="http://www.example.com" rel="noopener noreferrer" target="_blank">Facebook</a>. 
</p>

Extraction

<p> We love 
    <a href="https://google.com" rel="noopener noreferrer" target="_blank">Google</a> 
    and 
    <a href="Facebook.com" rel="noopener noreferrer" target="_blank">Facebook</a>. 
    <a href="www.example.com" rel="noopener noreferrer" target="_blank">Facebook</a>. 
    <a href="http://www.example.com" rel="noopener noreferrer" target="_blank">Facebook</a>. 
</p>