Regular Expressions 101

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

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

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Group 1(https?:\/\/(?:www\.|(?!www))[^\s\.]+\.[^\s]{2,}|www\.[^\s]+\.[^\s]{2,})

1st Alternativehttps?:\/\/(?:www\.|(?!www))[^\s\.]+\.[^\s]{2,}

httpthe literal text http (case sensitive)

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

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:www\.|(?!www))

1st Alternativewww\.

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternative(?!www)

Negative Lookahead(?!www)

wwwthe literal text www (case sensitive)

Negated Character Class[^\s\.]+

+matches at least one character outside the set below:

\sany whitespace character

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negated Character Class[^\s]{2,}

{2,}matches at least 2 characters outside the set below:

\sany whitespace character

2nd Alternativewww\.[^\s]+\.[^\s]{2,}

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negated Character Class[^\s]+

+matches at least one character outside the set below:

\sany whitespace character

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negated Character Class[^\s]{2,}

{2,}matches at least 2 characters outside the set below:

\sany whitespace character

Global pattern flags

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

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Search reference

Regular Expression

\[.*\]\((https?:\/\/(?:www\.|(?!www))[^\s\.]+\.[^\s]{2,}|www\.[^\s]+\.[^\s]{2,})

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