I am new with Asterisk, but have done over 30 years of telephony and software programming: QBasic to VB6 (some .net)
I have been successful in understanding a lot of the language in the Dial Plan, but need some help with REGEX.
I have search the internet (with no luck) trying to understand the following:
I know that the expression here says: Look in the ${ARG1} variable and see if it matches the pattern “^[0-9] {3,3}” and if there is a match, set anurisum = 1. If not, anurisum = 0
I need help with the {3,3} in peticular
Here are some test I made tring to understand how the {x,x} works
[0-9] {3,3} matches any digits of 3 or more.
[0-9] {3,4} matches any digits of 3 or more.
[0-9] {3,4} matches any digits of 3 or more.
[0-9] {3,6} matches any digits of 3 to more. (what is the digit 6 suppose to do here?)
(Why are all these expresions doing the same thing?)
[0-9] {3,3} fails
[9-0] {4,4} fails \ anurisum = “” (empty string) or NULL (can’t tell)
[9-0] {3,2} fails /
[9-0] {4,} fails /
[0-9] {3} matches any digits 3 or more (what gives?). Should {3} mean only 3 digits?
Please direct me to a web site or please explain how the {x,x} and {x,x} are suppose to work.
TIA,
Ira