Regular Expressions 101

Pro

Non-Capturing Group(?:https?:\/\/)?

?repeats the group contents below at most once:

httpthe literal text http (case insensitive)

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:w{3}\w+\.)?

?repeats the group contents below at most once:

w{3}the literal w (119₁₀ / 167₈ / 77₁₆) (case insensitive), repeated exactly 3 times

\w+any word character, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:[^:\.\/\n\r\s]+\.)*

*repeats the group contents below any number of times:

Negated Character Class[^:\.\/\n\r\s]+

+matches at least one character outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\na line-feed (newline) character (ASCII 10)

\ra carriage return (ASCII 13)

\sany whitespace character

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:[^:\.\/\n\r\s]+\.[^:\.\/\n\r\s]+)

Negated Character Class[^:\.\/\n\r\s]+

+matches at least one character outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\na line-feed (newline) character (ASCII 10)

\ra carriage return (ASCII 13)

\sany whitespace character

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negated Character Class[^:\.\/\n\r\s]+

+matches at least one character outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\na line-feed (newline) character (ASCII 10)

\ra carriage return (ASCII 13)

\sany whitespace character

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

x

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25 tokens

Regular Expression

(?:https?:\/\/)?(?:w{3}\w+\.)?(?:[^:\.\/\n\r\s]+\.)*(?:[^:\.\/\n\r\s]+\.[^:\.\/\n\r\s]+)

Unit Tests

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