Regular Expressions 101

^start of line

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\d{0,3}a Unicode decimal digit, repeated between 0 and 3 times

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[a-zA-Z]?

?matches at most one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

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

Non-Capturing Group(?: ?[/-] ?[1-9]\d{0,3} ?[a-zA-Z]?)?

?repeats the group contents below at most once:

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[/-]

/the literal / (47₁₀ / 57₈ / 2F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\d{0,3}a Unicode decimal digit, repeated between 0 and 3 times

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[a-zA-Z]?

?matches at most one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

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

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Search reference

Regular Expression

^[1-9]\d{0,3} ?[a-zA-Z]?(?: ?[/-] ?[1-9]\d{0,3} ?[a-zA-Z]?)?$

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