Javascript Regex to match only a single occurrence no more or less
Solution 1:
You can do this
/^[^-]+-[^-]+$/
^ depicts the start of the string
$ depicts the end of the string
[^-]+ matches 1 to many characters except -
Solution 2:
/^[^-]*-[^-]*$/
Beginning of string, any number of non-hyphens, a hyphen, any number of non-hyphens, end of string.