Regular Expressions 101

Group 1(<\w+\s*[^>]*)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

\w+any word character, repeated at least once

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

Negated Character Class[^>]*

*matches any number of characters outside the set below:

>the literal > (62₁₀ / 76₈ / 3E₁₆)

\sany whitespace character

Negative Lookahead(?!href|title|alt)

1st Alternativehref

hrefthe literal text href (case sensitive)

2nd Alternativetitle

titlethe literal text title (case sensitive)

3rd Alternativealt

altthe literal text alt (case sensitive)

Character Class[\w\-\d]+

+matches at least one character from the set below:

\wany word character

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

\da digit

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Non-Capturing Group(?:(['"]).*?\2|\w+)

1st Alternative(['"]).*?\2

Group 2(['"])

Character Class['"]

'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

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

\2the text saved by group 2

2nd Alternative\w+

\w+any word character, repeated at least once

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

(<\w+\s*[^>]*)\s(?!href|title|alt)[\w\-\d]+=(?:(['"]).*?\2|\w+)

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