[Asterisk-Users] Regular expression matching for ":" - examples needed

[John Todd]

It is again perhaps my recent spate of bad sleeping that has 
prevented my brain from wrapping around this explanation, or it is 
perhaps my inherent hatred of regular expression syntax.  However, I 
have been unable to put this into a working form after staring at it 
for a while and trying different recipes.  If anyone wants to take a 
stab at this, I'd appreciate it.

(from README.variables)
expr1 : expr2
              The `:' operator matches expr1 against expr2, which must be a
              regular expression.  The regular expression is anchored to the
              beginning of  the string with an implicit `^'.

              If the match succeeds and the pattern contains at least one regu-
              lar expression subexpression `\(...\)', the string correspond-
              ing to `\1' is returned; otherwise the matching operator
              returns the number of characters matched.  If the match fails and
              the pattern contains a regular expression subexpression the null
              string is returned; otherwise 0.


Examples I'd like to see:

1)
  ${FOO} contains 12345#
  ${HASH} contains #

  If ${FOO} contains the contents of ${HASH} anywhere, go to 2. If not, goto 102

exten=> 123,1,GotoIf($[...???...]?2|102)


1.1)
   If the last digit of ${FOO} is ${HASH}, then goto 2.  If not, goto 102.


exten => 123,1,GotoIf($[...???...]?2|102)



JT