Regex (JavaScript): match feet and/or inches

Question

I'm trying to match feet and inches but I can't manage to get "and/or" so if first half is correct it validates:

Code: (in javascript)

var pattern = "^(([0-9]{1,}\')?([0-9]{1,}\x22)?)+$";

function testing(input, pattern) {
        var regex = new RegExp(pattern, "g");
        console.log('Validate '+input+' against ' + pattern);
        console.log(regex.test(input));
    }

Valid tests should be:

• 1'
• 1'2"
• 2"
• 2 (assumes inches)

Not valid should be: * anything else including empty * 1'1'

But my regex matches the invalid 1'1'.

Answer 1

try this

var pattern = "^\d+(\'?(\d+\x22)?|\x22)$";

Answer 2

Not to resurrect the dead, but here was my best shot at detecting fractional feet and inches. It will find:

• 3'
• 3'-1" or 3' 1"
• 3'-1 1/2" or 3' 1 1/2"
• 3'-1/2", 3' 1/2", 3'-0 1/2", or 3'0 1/2"
• 1"
• 1/2"

The only catch is your flavor of regex has to support conditionals.

pattern = "(\d+')?(?:(?(1)(?: |\-))(\d{1,2})?(?:(?(2) )\d+\/\d+)?\x22)?"