Regular Expressions 101

Pro

^start of line

Positive Lookahead(?=.{8,9}$)

.{8,9}any character (except for line terminators), repeated between 8 and 9 times

$end of line

Character Class[NVQWST]

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

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

Qthe literal Q (81₁₀ / 121₈ / 51₁₆) (case sensitive)

Wthe literal W (87₁₀ / 127₈ / 57₁₆) (case sensitive)

Sthe literal S (83₁₀ / 123₈ / 53₁₆) (case sensitive)

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

Character Class[A-Z\s]{1,3}

{1,3}matches between 1 and 3 characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

\sany whitespace character

Character Class[0-9]{1,6}

{1,6}matches between 1 and 6 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Non-Capturing Group(?:(?<=^.{8})[A-Z])?

?repeats the group contents below at most once:

Positive Lookbehind(?<=^.{8})

^start of line

.{8}any character (except for line terminators), repeated exactly 8 times

Character Class[A-Z]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

$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

No unit tests · Add a test to get started

25 tokens

^(?=.{8,9}$)[NVQWST][A-Z\s]{1,3}[0-9]{1,6}(?:(?<=^.{8})[A-Z])?$

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