regex101: Fonction.Code

Explanation

Pro

^start of line

Character Class[A-Z]+

+matches at least one character from the set below:

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

Non-Capturing Group(?:-[A-Z]+)*

*repeats the group contents below any number of times:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[A-Z]+

+matches at least one character from the set below:

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

Quick Reference

25 tokens

Regular Expression

^[A-Z]+(?:-[A-Z]+)*$

New

PASS :
NOR
REGISTER
FLIP-FLOP
CPU
FLIP-FLOP-FLAP
A
A-A
ALL-GOOD
TIP-US-PLEASE
OR-IS-THERE-NO-WAY-TO-GET-STUDENT-RECOGNITION-FOR-DOMAINS

FAIL :
NO-TRAILING-DASH-
-ACTUALLY-NEITHER-WAY
NO-DIGIT-TEST1
2NO-DIGIT-TEST
N0-DIGIT-T3ST
NO-SPACE 
NO-SPE_CIAL-CHAR
SURE?YES

Extraction

PASS :
NOR
REGISTER
FLIP-FLOP
CPU
FLIP-FLOP-FLAP
A
A-A
ALL-GOOD
TIP-US-PLEASE
OR-IS-THERE-NO-WAY-TO-GET-STUDENT-RECOGNITION-FOR-DOMAINS

FAIL :
NO-TRAILING-DASH-
-ACTUALLY-NEITHER-WAY
NO-DIGIT-TEST1
2NO-DIGIT-TEST
N0-DIGIT-T3ST
NO-SPACE 
NO-SPE_CIAL-CHAR
SURE?YES