Regex to allow numbers and only one hyphen in the middle
php, regex
Solution
Try this one:
/^\d{1,2}(-\d{1,2})?$/
One or two digits, followed by, optionally, ( a hyphen followed by one or two digits)
Problem
I am trying to write a regular expression to allow numbers and only one hypen in the middle (cannot be at start or at the end) say pattern: `02-04` , `02`are acceptable but pattern: `--` or `-` or `-02` or `04-` or `02-04-06` are unacceptable I tried something like this but this would allow - at the beginning and also allow multiple - ``` '/^[0-9 \-]+$/' ``` I am not that good with regex so a little explanation would be real helpful. EDIT: Sorry to bug you again with this but I need the numbers to be of only 2 digits (123-346) should be considered invalid.