Asterisk Dialplan Phone exten to RegEx

Question

Need to build a RegEx, that came from asterisk dialplan (Brazil Number)

valid      = 0021987126408
not valid  = 002198712640
not valid  = 3021987126408
valid      = 0021987126408

need to validate asterisk with dialplan => 00ZX[789]XXXXXXXXX

check in order .....

• check if the two first numbers is ZERO

• check ZX (brazilian DD)

• check (7,8 or 9)

• check if XXXXXXXXX has the same quantity of numbers in the end

basicly transcribe asterisk Dialplan to Normal REGEX.

Answer 1

RegEx = ^(00\d{2}[7-9]\d{8})$

valid      = 0021987126408
not valid  = 002198712640
not valid  = 3021987126408
valid      = 0021987126408