Why this match fail?

I have this code :

var tlTe开发者_JAVA百科mp=new Array();

tlTemp.push("00 - 01:??:?? - TL 1");
tlTemp.push("00 - 12:??:?? - TL 2");

for(i=0; i<tlTemp.length; i++) {
    var removedTL = tlTemp[i].match(/^(\d\d) - (\?\?|10|0\d):(\?\?|[0-5]\d):(\?\?|[0-5]\d) - (.*)/);

    if(removedTL!=null) {
        alert("ok");
    }
    else
    {
        alert("no");
        return;
    }
}

and I don't understand why first string print ok and the second (so similar) no. Why?

The appropriate part of the regexp that defines the different part of the string is:

(\?\?|10|0\d)

It matches:

??
10
0x   where x is a digit

So 12 does not match.

Now, also there is TL 2 instead of TL 1 but in the regexp this is defined as:

(.*)

which matches everything so that is not causing the problem.

Because your regular expression explicitly excludes it.

This section:

/^(\d\d) - (\?\?|10|0\d)

constrains matches to strings starting with two digits, a space, a dash, and a space, and then either "??", "10", or "0" followed by a digit.

This part of your regular expression: (\?\?|10|0\d) should be changed to (\?\?|10|\d\d). The zero is changed to a \d. in the first string, that part of the string is 01, while the second string has 12, not matching the regular expression.