[asterisk-users] escaping regular expression

[D Tucny]

2009/2/4 Klaus Darilion <klaus.mailinglists at pernau.at>

>
>
> D Tucny schrieb:
> > 2009/2/4 Klaus Darilion <klaus.mailinglists at pernau.at
> > <mailto:klaus.mailinglists at pernau.at>>
> >
> >     Hi!
> >
> >     I am going nuts using REGEXP. I just want to verify if a variable
> >     contains a valid +E164 phone number.
> >
> >     These, the the pattern is ^\+[0-9]+
> >
> >     First I tried:
> >
> >       Set(pattern=^\+[0-9]+);
> >       if (${REGEX("${pattern}" ${${var}})})
> >
> >     but that does not work, the backslash is removed, as seen in the log
> >     file:
> >
> >       func_strings.c: FUNCTION REGEX (^+[0-9]+)(+4312345
> >     <http://www.adaanumber.com/>)
> >
> >     So, meanwhile I tried to escape the backslash. I tried:
> >       Set(pattern=^\\+[0-9]+);
> >       Set(pattern=^\\\+[0-9]+);
> >       Set(pattern=^\\\\+[0-9]+);
> >
> >     But always the same result:
> >
> >       func_strings.c: FUNCTION REGEX (^+[0-9]+)(+4312345)
> >
> >     How can I solve this problem?
> >
> >
> > Try something like... pattern=^[+]\{1\}[0-9]+
>
> Are you sure? The \ should be in front of the +
>
>
Pretty sure...

exten => *56,1,NoOp("Starting regexp test")
exten => *56,n,Set(pattern=^[+]\{1\}[0-9]+)
exten => *56,n,Set(var=123456789)
exten => *56,n,NoOp(${IF(${REGEX("${pattern}" ${var})}?"Match":"No
Match")}))
exten => *56,n,Set(var=+123456789)
exten => *56,n,NoOp(${IF(${REGEX("${pattern}" ${var})}?"Match":"No
Match")}))


[Feb  4 23:49:21] DEBUG[20518] pbx.c: Launching 'NoOp'
[Feb  4 23:49:21] VERBOSE[20518] logger.c:     -- Executing
[*56 at phonedefault:1] NoOp("SIP/*01-09bd8ff8", ""Starting regexp test"") in
new stack
[Feb  4 23:49:21] DEBUG[20518] pbx.c: Launching 'Set'
[Feb  4 23:49:21] VERBOSE[20518] logger.c:     -- Executing
[*56 at phonedefault:2] Set("SIP/*01-09bd8ff8", "pattern=^[+]\{1\}[0-9]+") in
new stack
[Feb  4 23:49:21] DEBUG[20518] pbx.c: Launching 'Set'
[Feb  4 23:49:21] VERBOSE[20518] logger.c:     -- Executing
[*56 at phonedefault:3] Set("SIP/*01-09bd8ff8", "var=123456789") in new stack
[Feb  4 23:49:21] DEBUG[20518] func_strings.c: FUNCTION REGEX
(^[+]{1}[0-9]+)(123456789)
[Feb  4 23:49:21] DEBUG[20518] pbx.c: Function result is '0'
[Feb  4 23:49:21] DEBUG[20518] pbx.c: Function result is '"No Match"'
[Feb  4 23:49:21] DEBUG[20518] pbx.c: Launching 'NoOp'
[Feb  4 23:49:21] VERBOSE[20518] logger.c:     -- Executing
[*56 at phonedefault:4] NoOp("SIP/*01-09bd8ff8", ""No Match")") in new stack
[Feb  4 23:49:21] DEBUG[20518] pbx.c: Launching 'Set'
[Feb  4 23:49:21] VERBOSE[20518] logger.c:     -- Executing
[*56 at phonedefault:5] Set("SIP/*01-09bd8ff8", "var=+123456789") in new stack
[Feb  4 23:49:21] DEBUG[20518] func_strings.c: FUNCTION REGEX
(^[+]{1}[0-9]+)(+123456789)
[Feb  4 23:49:21] DEBUG[20518] pbx.c: Function result is '1'
[Feb  4 23:49:21] DEBUG[20518] pbx.c: Function result is 'Match'
[Feb  4 23:49:21] DEBUG[20518] pbx.c: Launching 'NoOp'
[Feb  4 23:49:21] VERBOSE[20518] logger.c:     -- Executing
[*56 at phonedefault:6] NoOp("SIP/*01-09bd8ff8", "Match)") in new stack

So, the \ is still stripped (ast_app_separate_args removes \), but, it
doesn't matter as the + is bracketed so it's not the first character after
the ^ and so regcomp doesn't fail...

d
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