Regular Expressions 101

Pro

Negative Lookbehind(?<!\S)

\Sany character that is not Unicode whitespace

Positive Lookahead(?=\S)

\Sany character that is not Unicode whitespace

p?optionally matches the literal p (112₁₀ / 160₈ / 70₁₆) (case sensitive)

Non-Capturing Group(?:T[X0-4]?)?

?repeats the group contents below at most once:

Tthe literal T (84₁₀ / 124₈ / 54₁₆) (case sensitive)

Character Class[X0-4]?

?matches at most one character from the set below:

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

0-4one character from 0 (48₁₀) to 4 (52₁₀)

\s?optionally matches a Unicode whitespace character

Non-Capturing Group(?:V[X0-2])?

?repeats the group contents below at most once:

Vthe literal V (86₁₀ / 126₈ / 56₁₆) (case sensitive)

Character Class[X0-2]

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

0-2one character from 0 (48₁₀) to 2 (50₁₀)

\s?optionally matches a Unicode whitespace character

Non-Capturing Group(?:N[X0-3])?

?repeats the group contents below at most once:

Nthe literal N (78₁₀ / 116₈ / 4E₁₆) (case sensitive)

Character Class[X0-3]

Xthe literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

0-3one character from 0 (48₁₀) to 3 (51₁₀)

Negative Lookahead(?!\S)

\Sany character that is not Unicode whitespace

Positive Lookbehind(?<=\S)

\Sany character that is not Unicode whitespace

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

No unit tests · Add a test to get started

25 tokens

(?<!\S)(?=\S)p?(?:T[X0-4]?)?\s?(?:V[X0-2])?\s?(?:N[X0-3])?(?!\S)(?<=\S)

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