Regular Expressions 101

Pro

Branch Reset Group(?|(?<txt>(?<url>(?:ht|f)tps?://\S+(?<=\PP)))|\(([^)]+)\)\[(\g<url>)])

1st Alternative(?<txt>(?<url>(?:ht|f)tps?://\S+(?<=\PP)))

Group txt(?<txt>(?<url>(?:ht|f)tps?://\S+(?<=\PP)))

Group url(?<url>(?:ht|f)tps?://\S+(?<=\PP))

Non-Capturing Group(?:ht|f)

1st Alternativeht

htthe literal text ht (case sensitive)

2nd Alternativef

fthe literal f (102₁₀ / 146₈ / 66₁₆) (case sensitive)

tpthe literal text tp (case sensitive)

s?optionally matches the literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

://the literal text ://

\S+any non-whitespace character, repeated at least once

Positive Lookbehind(?<=\PP)

\PPcharacters not matched by \pP

2nd Alternative\(([^)]+)\)\[(\g<url>)]

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Group 1([^)]+)

Negated Character Class[^)]+

+matches at least one character outside the set below:

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group 2(\g<url>)

\g<url>calls group url as a subroutine

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(?|(?<txt>(?<url>(?:ht|f)tps?://\S+(?<=\PP)))|\(([^)]+)\)\[(\g<url>)])

New

In Markdown there is two ways to place a link, one is to just type the raw link in, like: http://example.com, the other is to use the ()[] syntax: (Stack Overflow)[http://example.com].

Extraction

In Markdown there is two ways to place a link, one is to just type the raw link in, like: http://example.com, the other is to use the ()[] syntax: (Stack Overflow)[http://example.com].