Regular Expressions 101

Explanation

Pro

^start of line

<the literal < (60₁₀ / 74₈ / 3C₁₆)

Group url(?<url>[^>]*)

Negated Character Class[^>]*

*matches any number of characters outside the set below:

>the literal > (62₁₀ / 76₈ / 3E₁₆)

Non-Capturing Group(?:[ \t]*;[ \t]*[\x21\x23-\x27\x2A\x2B\x2D\x2E\x5E-\x60\x7C\x7E\x30-\x39\x41-\x5A\x61-\x7A]+[ \t]*(?:=[ \t]*(?:[\x21\x23-\x27\x2A\x2B\x2D\x2E\x5E-\x60\x7C\x7E\x30-\x39\x41-\x5A\x61-\x7A]+|\x22(?:[\x09\x20\x21\x23-\x5B\x5D-\x7E\x80-\xFF]|\x5C[\x09\x20\x21-\x7E\x80-\xFF])*\x22))?)*

*repeats the group contents below any number of times:

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

Character Class[\x21\x23-\x27\x2A\x2B\x2D\x2E\x5E-\x60\x7C\x7E\x30-\x39\x41-\x5A\x61-\x7A]+

+matches at least one character from the set below:

\x21the literal ! (21₁₆ / 41₈ / 33₁₀)

\x23-\x27one character from # (35₁₀) to ' (39₁₀)

\x2Athe literal * (2A₁₆ / 52₈ / 42₁₀)

\x2Bthe literal + (2B₁₆ / 53₈ / 43₁₀)

\x2Dthe literal - (2D₁₆ / 55₈ / 45₁₀)

\x2Ethe literal . (2E₁₆ / 56₈ / 46₁₀)

\x5E-\x60one character from ^ (94₁₀) to ` (96₁₀)

\x7Cthe literal | (7C₁₆ / 174₈ / 124₁₀)

\x7Ethe literal ~ (7E₁₆ / 176₈ / 126₁₀)

\x30-\x39one character from 0 (48₁₀) to 9 (57₁₀)

\x41-\x5Aone character from A (65₁₀) to Z (90₁₀) (case sensitive)

\x61-\x7Aone character from a (97₁₀) to z (122₁₀) (case sensitive)

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

Non-Capturing Group(?:=[ \t]*(?:[\x21\x23-\x27\x2A\x2B\x2D\x2E\x5E-\x60\x7C\x7E\x30-\x39\x41-\x5A\x61-\x7A]+|\x22(?:[\x09\x20\x21\x23-\x5B\x5D-\x7E\x80-\xFF]|\x5C[\x09\x20\x21-\x7E\x80-\xFF])*\x22))?

?repeats the group contents below at most once:

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

Non-Capturing Group(?:[\x21\x23-\x27\x2A\x2B\x2D\x2E\x5E-\x60\x7C\x7E\x30-\x39\x41-\x5A\x61-\x7A]+|\x22(?:[\x09\x20\x21\x23-\x5B\x5D-\x7E\x80-\xFF]|\x5C[\x09\x20\x21-\x7E\x80-\xFF])*\x22)

1st Alternative[\x21\x23-\x27\x2A\x2B\x2D\x2E\x5E-\x60\x7C\x7E\x30-\x39\x41-\x5A\x61-\x7A]+

Character Class[\x21\x23-\x27\x2A\x2B\x2D\x2E\x5E-\x60\x7C\x7E\x30-\x39\x41-\x5A\x61-\x7A]+

+matches at least one character from the set below:

\x21the literal ! (21₁₆ / 41₈ / 33₁₀)

\x23-\x27one character from # (35₁₀) to ' (39₁₀)

\x2Athe literal * (2A₁₆ / 52₈ / 42₁₀)

\x2Bthe literal + (2B₁₆ / 53₈ / 43₁₀)

\x2Dthe literal - (2D₁₆ / 55₈ / 45₁₀)

\x2Ethe literal . (2E₁₆ / 56₈ / 46₁₀)

\x5E-\x60one character from ^ (94₁₀) to ` (96₁₀)

\x7Cthe literal | (7C₁₆ / 174₈ / 124₁₀)

\x7Ethe literal ~ (7E₁₆ / 176₈ / 126₁₀)

\x30-\x39one character from 0 (48₁₀) to 9 (57₁₀)

\x41-\x5Aone character from A (65₁₀) to Z (90₁₀) (case sensitive)

\x61-\x7Aone character from a (97₁₀) to z (122₁₀) (case sensitive)

2nd Alternative\x22(?:[\x09\x20\x21\x23-\x5B\x5D-\x7E\x80-\xFF]|\x5C[\x09\x20\x21-\x7E\x80-\xFF])*\x22

\x22the literal " (22₁₆ / 42₈ / 34₁₀)

Non-Capturing Group(?:[\x09\x20\x21\x23-\x5B\x5D-\x7E\x80-\xFF]|\x5C[\x09\x20\x21-\x7E\x80-\xFF])*

*repeats the group contents below any number of times:

1st Alternative[\x09\x20\x21\x23-\x5B\x5D-\x7E\x80-\xFF]

Character Class[\x09\x20\x21\x23-\x5B\x5D-\x7E\x80-\xFF]

\x09the literal (9₁₆ / 11₈ / 9₁₀)

\x20the literal (20₁₆ / 40₈ / 32₁₀)

\x21the literal ! (21₁₆ / 41₈ / 33₁₀)

\x23-\x5Bone character from # (35₁₀) to [ (91₁₀)

\x5D-\x7Eone character from ] (93₁₀) to ~ (126₁₀)

\x80-\xFFone character from (128₁₀) to ÿ (255₁₀) (case sensitive)

2nd Alternative\x5C[\x09\x20\x21-\x7E\x80-\xFF]

\x5Cthe literal \ (5C₁₆ / 134₈ / 92₁₀)

Character Class[\x09\x20\x21-\x7E\x80-\xFF]

\x09the literal (9₁₆ / 11₈ / 9₁₀)

\x20the literal (20₁₆ / 40₈ / 32₁₀)

\x21-\x7Eone character from ! (33₁₀) to ~ (126₁₀)

\x80-\xFFone character from (128₁₀) to ÿ (255₁₀) (case sensitive)

\x22the literal " (22₁₆ / 42₈ / 34₁₀)

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

relthe literal text rel (case sensitive)

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Character Class[ \t]*

*matches any number of characters from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

Group rel(?<rel>[\x21\x23-\x27\x2A\x2B\x2D\x2E\x5E-\x60\x7C\x7E\x30-\x39\x41-\x5A\x61-\x7A]+|\x22(?:[\x09\x20\x21\x23-\x5B\x5D-\x7E\x80-\xFF]|\x5C[\x09\x20\x21-\x7E\x80-\xFF])*\x22)

1st Alternative[\x21\x23-\x27\x2A\x2B\x2D\x2E\x5E-\x60\x7C\x7E\x30-\x39\x41-\x5A\x61-\x7A]+

Character Class[\x21\x23-\x27\x2A\x2B\x2D\x2E\x5E-\x60\x7C\x7E\x30-\x39\x41-\x5A\x61-\x7A]+

+matches at least one character from the set below:

\x21the literal ! (21₁₆ / 41₈ / 33₁₀)

\x23-\x27one character from # (35₁₀) to ' (39₁₀)

\x2Athe literal * (2A₁₆ / 52₈ / 42₁₀)

\x2Bthe literal + (2B₁₆ / 53₈ / 43₁₀)

\x2Dthe literal - (2D₁₆ / 55₈ / 45₁₀)

\x2Ethe literal . (2E₁₆ / 56₈ / 46₁₀)

\x5E-\x60one character from ^ (94₁₀) to ` (96₁₀)

\x7Cthe literal | (7C₁₆ / 174₈ / 124₁₀)

\x7Ethe literal ~ (7E₁₆ / 176₈ / 126₁₀)

\x30-\x39one character from 0 (48₁₀) to 9 (57₁₀)

\x41-\x5Aone character from A (65₁₀) to Z (90₁₀) (case sensitive)

\x61-\x7Aone character from a (97₁₀) to z (122₁₀) (case sensitive)

2nd Alternative\x22(?:[\x09\x20\x21\x23-\x5B\x5D-\x7E\x80-\xFF]|\x5C[\x09\x20\x21-\x7E\x80-\xFF])*\x22

Character Class[ \t]*

Non-Capturing Group(?:[,;]|$)

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

^<(?<url>[^>]*)>(?:[ \t]*;[ \t]*[\x21\x23-\x27\x2A\x2B\x2D\x2E\x5E-\x60\x7C\x7E\x30-\x39\x41-\x5A\x61-\x7A]+[ \t]*(?:=[ \t]*(?:[\x21\x23-\x27\x2A\x2B\x2D\x2E\x5E-\x60\x7C\x7E\x30-\x39\x41-\x5A\x61-\x7A]+|\x22(?:[\x09\x20\x21\x23-\x5B\x5D-\x7E\x80-\xFF]|\x5C[\x09\x20\x21-\x7E\x80-\xFF])*\x22))?)*[ \t]*;[ \t]*rel[ \t]*=[ \t]*(?<rel>[\x21\x23-\x27\x2A\x2B\x2D\x2E\x5E-\x60\x7C\x7E\x30-\x39\x41-\x5A\x61-\x7A]+|\x22(?:[\x09\x20\x21\x23-\x5B\x5D-\x7E\x80-\xFF]|\x5C[\x09\x20\x21-\x7E\x80-\xFF])*\x22)[ \t]*(?:[,;]|$)

New

</test/11/webmention>;me; rel="webmention"; pa=wow
</test/11/webmention>;me; rel=webmention; pa=wow
</test/11/webmention>;me; rel="webmention and more"; pa=wow
</test/11/webmention>;me; rel=webmention, </test/11/webmention>;me; rel=webmention;