Regular Expressions 101

Pro

\ban ASCII word boundary

Group 1((?:href|src)=)

Non-Capturing Group(?:href|src)

1st Alternativehref

hrefthe literal text href (case sensitive)

2nd Alternativesrc

srcthe literal text src (case sensitive)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

examplethe literal text example (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case sensitive)

Group 2(["']?)

Character Class["']?

?matches at most one character from the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

Group 3([^"']+)

Negated Character Class[^"']+

+matches at least one character outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

\2the text saved by group 2

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.

26 tokens

Regular Expression

\b((?:href|src)=)(?!\/\/example\.com)(["']?)([^"']+)\2

New

<html>
<link rel="stylesheet" href="/thing.css">

<body>
    <script src="/nothing.js"></script>
    <link rel="stylesheet" href="/styles.css">
    <a href='#a_hash'>A link</a>
</body>

</html>

Extraction

<html>
<link rel="stylesheet" href="/thing.css">

<body>
    <script src="/nothing.js"></script>
    <link rel="stylesheet" href="/styles.css">
    <a href='#a_hash'>A link</a>
</body>

</html>