Validation is username:

Line 54 in dbd5b4a

Name string `json:"name" validate:"username,required"`

Which is a custom registered validator here:

Lines 34 to 47 in 3151bef

    
           err := validate.RegisterValidation("username", func(fl validator.FieldLevel) bool { 
        
           	f := fl.Field().Interface() 
        
           	str, ok := f.(string) 
        
           	if !ok { 
        
           		return false 
        
           	} 
        
           	if len(str) > 32 { 
        
           		return false 
        
           	} 
        
           	if len(str) < 1 { 
        
           		return false 
        
           	} 
        
           	return usernameRegex.MatchString(str) 
        
           })

The regex it's comparing usernames to beyond those simple len checks is:

coder/coderd/httpapi/httpapi.go

Line 18 in 3151bef

usernameRegex = regexp.MustCompile("^[a-zA-Z0-9]+(?:-[a-zA-Z0-9]+)*$")

Note: this wasn't entirely obvious how to track down (noting the lack of validation as part of go docs).

	err := validate.RegisterValidation("username", func(fl validator.FieldLevel) bool {
	f := fl.Field().Interface()
	str, ok := f.(string)
	if !ok {
	return false
	}
	if len(str) > 32 {
	return false
	}
	if len(str) < 1 {
	return false
	}
	return usernameRegex.MatchString(str)
	})

UI: Entering an invalid a Workspace Name in Create returns no error #1421

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