Escaping regex + character

[Franks Andy (RLZ) IT Systems Engineer]

Hi All,
  Just a quick question - I've compiled FR3 with pcre regex libraries
and it's working ok. I just can't get it to escape plusses ( + ) though
I've tried between 0 and 6(!) backslashes but all result in:

ERROR: Failed compiling regular expression: bad range inside [] at
offset 10
(0) ERROR: Condition evluation failed because the value of an operand
could not be determined

It's the + in the character class I'm trying to escape. This is with two
backslashes (what I'd expect to work as it does with dots - \\.

(0)    ? if ("%{Email-Address}" =~
/^[a-z0-9_-\+]+(\.[a-z0-9_-\\\+])*@[a-z0-9_-\\\+]+(\.[a-z0-9_-\\\+]+)*(\
.[a-z]{2,4})$/)
(0)     expand: "%{Email-Address}" -> 'a+b at c.de'
ERROR: Failed compiling regular expression: bad range inside [] at
offset 10
(0) ERROR: Condition evluation failed because the value of an operand
could not be determined

The regex works ok without the plusses, if not including them in the
subject..

Thanks
Andy
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