Today I have come across a generated piece of XSD definition and it's restricted with a specific pattern
(0[4-9])|(1[0-9])|(2[0-6])
It puzzled me for a little time, and found the answer after little bit of testing. What it means is any value within 04 - 26 is a valid value.
(0[4-9]) Any digit between 4 to 9 prefixed by zero
| or
(1[0-9]) Any digit between 0 to 9 prefixed by one
| or
(2[0-6]) Any digit between 0 to 6 prefixed by two
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