Regex : Match 1 to 60 or all

Question

I need some help on a REGEX in php (Symfony).

I want to match values 1 to 60 or string all.

For number I've use this : ^([1-5]?[0-9]|60) but It match 0 ... And I don't now how can match "all".

Can you help me ? Many thanks before

Answer 1

You should be able to divide it into possibilities as follows:

^([1-9]|[1-5][0-9]|60|all)$

This gives you four possibilities:

• [1-9] the single-digit values.
• [1-5][0-9]: everything from ten to fifty-nine.
• 60: sixty.
• all: your "all" option.

But keep in mind that regular expressions are not always the answer to every question.

Sometimes they're less useful for complicated value checks (though, in this case, it's a fairly simple one). Something like the following (pseudo-code):

def isAllOrOneThruSixty(str):
    if str == "all":
        return OK
    if str.matches ("[0-9]+"):
        val = str.convertToInt()
        if val >= 1 and val <= 60:
            return OK
    return BAD

can sometimes be, while more verbose, also more readable and maintainable.

Answer 2

This will match all you need

^([1-9]|[1-5]\d|60|all)$