regex101: Match Legal HTML Tags

Pro

<the literal < (60₁₀ / 74₈ / 3C₁₆)

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

Character Class[a-zA-Z]

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Character Class[a-zA-Z0-9]*

*matches any number of characters from the set below:

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\ban ASCII word boundary

Non-Capturing Group(?:\s+[a-zA-Z][a-zA-Z0-9]*\s*=\s*"(?:[^"]*)"|\s*[a-zA-Z][a-zA-Z0-9]*\s*=\s*'(?:[^']*)')*

*repeats the group contents below any number of times:

1st Alternative\s+[a-zA-Z][a-zA-Z0-9]*\s*=\s*"(?:[^"]*)"

\s+any whitespace character, repeated at least once

Character Class[a-zA-Z]

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Character Class[a-zA-Z0-9]*

*matches any number of characters from the set below:

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\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)

Non-Capturing Group(?:[^"]*)

Negated Character Class[^"]*

*matches any number of characters outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

2nd Alternative\s*[a-zA-Z][a-zA-Z0-9]*\s*=\s*'(?:[^']*)'

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

Character Class[a-zA-Z]

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Character Class[a-zA-Z0-9]*

*matches any number of characters from the set below:

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

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

\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 ' (39₁₀ / 47₈ / 27₁₆)

Non-Capturing Group(?:[^']*)

Negated Character Class[^']*

*matches any number of characters outside the set below:

'the literal ' (39₁₀ / 47₈ / 27₁₆)

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

\/?optionally matches the literal / (47₁₀ / 57₈ / 2F₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

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

<\s*[a-zA-Z][a-zA-Z0-9]*\b(?:\s+[a-zA-Z][a-zA-Z0-9]*\s*=\s*"(?:[^"]*)"|\s*[a-zA-Z][a-zA-Z0-9]*\s*=\s*'(?:[^']*)')*\s*\/?>

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