This should work: ^([a-zA-Z0-9]-[a-zA-Z0-9])+$ Also if you want to have exactly 135 hyphens: ^([a-zA-Z0-9]-[a-zA-Z0-9]){135}$...

hh:mm 24

Work in progress Regex transform for parsing SessionM targeting config from YAML

STARTKEYWORD (.+?)(?:$| ENDKEYWORD$)