Regular Expressions 101

^start of line

Non-Capturing Group(?:[A-Za-z]{1,3}\d{0,10})

Character Class[A-Za-z]{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)

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

\d{0,10}a digit, repeated between 0 and 10 times

Non-Capturing Group(?::(?:[A-Za-z]{1,3}\d{0,10}))?

?repeats the group contents below at most once:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Non-Capturing Group(?:[A-Za-z]{1,3}\d{0,10})

Character Class[A-Za-z]{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)

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

\d{0,10}a digit, repeated between 0 and 10 times

$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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?:[A-Za-z]{1,3}\d{0,10})(?::(?:[A-Za-z]{1,3}\d{0,10}))?$

A1
A1:C4
AB:AB
1:1 # don't match