Regular Expressions 101

Group 1((?:src|href)\s*=\s*")

Non-Capturing Group(?:src|href)

1st Alternativesrc

srcthe literal text src (case sensitive)

2nd Alternativehref

hrefthe literal text href (case sensitive)

\s*any whitespace character, repeated any number of times

=the literal = (61₁₀ / 75₈ / 3D₁₆)

\s*any whitespace character, repeated any number of times

"the literal " (34₁₀ / 42₈ / 22₁₆)

Group 2((?!{{\s*asset)[^"]+)

Negative Lookahead(?!{{\s*asset)

{{the literal text {{

\s*any whitespace character, repeated any number of times

assetthe literal text asset (case sensitive)

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

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Search reference

Regular Expression

((?:src|href)\s*=\s*")((?!{{\s*asset)[^"]+)

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