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Letters (a-z, A-Z), numbers, underscores, hyphens and dots.

Length: [1,256]Pattern: ^[a-zA-Z0-9_.-]+$

Any printable characters, including letters from any script, punctuation and emoji. Cannot contain line breaks, tabs, other control characters, invisible formatting characters (zero-width and bidirectional marks), and cannot start or end with whitespace.

Length: [1,256]Pattern: ^(?!\s)(?!.*\s$)[^\p{Cc}\p{Cf}\p{Zl}\p{Zp}]+$

Any printable characters and line breaks. Cannot contain control characters other than tab, carriage return and line feed, nor invisible formatting characters (zero-width and bidirectional marks), and cannot start or end with whitespace.

Length: [0,256]Pattern: ^(?!\s)(?![\s\S]*\s$)(?:[^\p{Cc}\p{Cf}\p{Zl}\p{Zp}]|[\t\n\r])+$