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Regular Expression
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^[^\p{L}:]|.[^\p{L}0-9:\-_]|[^\p{L}0-9]$
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Unit Tests
wdadù
→ regex does match
-wdadw
→ regex does match
_wdwdawd
→ regex does match
23
→ regex does match
_33454
→ regex does match
.2435
→ regex does match
now
how
→ regex does match
dww
→ regex does match
test-now
→ regex does match
àwdawd
→ regex does match
wad-àùùdw
→ regex does match
test\\now.:thisOK
→ regex does match
:nowOk
→ regex does match
=bad
→ regex does match
better_opt
→ regex does match
not-badending-
→ regex does match
test2-number
→ regex does match