Question

I’m playing around with the pattern attribute in html5. It accepts a regular expression in order to deem a form-field valid or invalid.

I want a field to be valid if it contains the word John and nothing else. How do I do this with regular expression?

Answer 1

Should be something like this:

pattern="^John$"

Edit: Actually, it looks like ^ and $ are implied, so this would be sufficient:

pattern="John"

As pointed out by Tim Pietzcker, to specify a case insensitive match, you would use the following:

pattern="(?i)john"