Regular Expressions 101

Positive Lookbehind(?<=/|^)

1st Alternative/

/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative^

^start of line

Negative Lookahead(?!\.\.(?![^/]))

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negative Lookahead(?![^/])

Negated Character Class[^/]

/the literal / (47₁₀ / 57₈ / 2F₁₆)

Negated Character Class[^/\n]+

+matches at least one character outside the set below:

/the literal / (47₁₀ / 57₈ / 2F₁₆)

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

/the literal / (47₁₀ / 57₈ / 2F₁₆)

(?R)?optionally recurses into the entire pattern

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:/|$)

1st Alternative/

/the literal / (47₁₀ / 57₈ / 2F₁₆)

2nd Alternative$

$end of line

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

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25 tokens

Regular Expression

(?<=/|^)(?!\.\.(?![^/]))[^/\n]+/(?R)?\.\.(?:/|$)

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