Regular Expressions 101

Pro

\ban ASCII word boundary

Non-Capturing Group(?:icn)?

?repeats the group contents below at most once:

icnthe literal text icn (case sensitive)

number:the literal text number: (case sensitive)

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

Negated Character Class[^\W_]+

+matches at least one character outside the set below:

\Wany non-word character

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

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.

25 tokens

\b(?:icn)?number:\K[^\W_]+

New

icnnumber:9876AB54321_IN
number:987654321FR
icnnumber:987654321YQ