On the regular expression of Stata

I found regular expression of Stata very confusing. For instance:

Code:

disp regexm("010-11223344","\d{3}-\d{8}")

Stata return 0 for the evaluation, then I modified re as:

Code:

disp regexm("010-11223344","[0-9]{3}-[0-9]{8}")

Stata still told me 0 result. Finally, I rewrote:

Code:

disp("010-11223344","[0-9][0-9][0-9]-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]")

and Stata return 1.
I really felt it silly the way writing regular expression in Stata. It will be a catastrophe when we encounter a more complex one.

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