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  1. local np = 'abc_123'
  2. local a = np:match('^[a-zA-Z0-9_][a-zA-Z0-9_][a-zA-Z0-9_]+$' )
  3. print (a)
  4. local np2 = 'ab'
  5. local b = np2:match('^[a-zA-Z0-9_][a-zA-Z0-9_][a-zA-Z0-9_]+$' )
  6. print (b)
Success #stdin #stdout 0s 2832KB
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stdin
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Standard input is empty
stdout
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abc_123
nil
https://ideone.com/E2M7Kr
language:
Lua (luac 5.3.3)
created:
9 years ago
visibility:
secret

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