Regular expressions (briefly)
All regular expressions start with “_” character in dial examinations.
“X” means any number, “N” is any number other than 0 or 1
“.” means any number of characters
Brackets represent groups, with standard “-” and “,” meanings ([1-9] or [0,1,2])
Example: _1410985012X is the same as _1410985012[0-9]