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Regular Expression
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^(?![_ -])(?:(?![_ -]{2})[\w -]){5,16}(?<![_ -])$
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gm
Input 1
1
New
** VALID ** usern username-is-writ username is here username_is_here ** INVALID ** user username-is-written-here -username _username username username- username_ username username--here username here username__here username- here username _here
Extraction
** VALID ** usern username-is-writ username is here username_is_here ** INVALID ** user username-is-written-here -username _username username username- username_ username username--here username here username__here username- here username _here