Regex to validate the alpha numeric which optionally include the hypen or space-CodePudding

Validate the given string which includes the alphanumeric of the length either 6 or 7 (includes space or hyphen only once)

the input string length is either 6 or 7 characters if includes a hyphen or space its length should be 7. Only one space or Hyphen is allowed as a max

Note: the Hyphen or Space is any place in the string and in the below example given few

ex: 
A12B3C    -> Valid 
ACB1234   -> Valid
123H67J   -> Valid
ABC-123   -> Valid
ANV 123   -> Valid 
ABV-12345 -> Not Valid 
ABC 1234  -> Not Valid 
ABC-12    -> NOT Valid
ABC 12    -> Not Valid
ABV--35 -> Not Valid
AV- 345 -> Not Valid  
AV- 124 -> Not Valid 
AV- 124 -> Not Valid 
AV-12 5 -> Not Valid 
AV-12 5 -> Not Valid

Regex: ^(?![^0-9A-Z]*([0-9A-Z])(?:[^0-9A-Z]*\1) [^0-9A-Z]*$)(?=.{7}$)[0-9A-Z] (?:[- ][0-9A-Z] )?$

failed the cases like ANV123 as its expected 7 characters

CodePudding user response：

Here's the solution as discussed in the comments of your main post.

^[A-Z0-9]{6,7}$|(?=^.{7}$)^[A-Z0-9] [- ]?[A-Z0-9] $

When asking a question, please be sure to outline all of your requirements. Its very hard for people to give a correct solution to questions that they don't know the full context of.

CodePudding user response：

From looking at your examples, it sounds like what you want is:

Three alphabetic characters [A-Z]{3}
An optional space or hyphen [ -]?
Three or four digits [0-9]{3,4}

Which looks like this, with the beginning and end of string anchors.

^[A-Z]{3}[ -]?[0-9]{3,4}$