[Users] openser 1.2 migration questions

[Anatoly Pidruchny]

Just a thought. How about the following idea:
1. Before compiling the regex, change it the following way: prefix -> 
^(prefix).*$
2. Match the called number to all the provisioned prefixes.
3. The "best" match amongst the matched regexes is the one where the 
length of the substring matched to the first subpattern (part of the 
regex in the parentheses) is the longest.

The drawback of this approach is that it is necessary to always try to 
match against all the prefixes, so, if it is necessary to support many 
prefixes then it is not a good idea.

Anatoly.
> Hi Juha,
>
> I know that you were referring to Alan's setup.  I was just pointing
> out that regex has this issue in general.
>
> Let's consider the following example: a call to a 1800 number.
> The destination is 18001231234 and in the lcr table we have the
> following two prefixes:
> 1. ^18[01234567]
> 2. ^18[0-2]01
>
> The second prefix is a better match for the 1800 number, but it has a
> shorter length.
>
>
>
> -ovi
>
> On 6/8/07, Juha Heinanen <jh at tutpro.com> wrote:
>> Ovidiu Sas writes:
>>
>>  > This would be an issue for prefix regex matching.
>>
>> i was referring to alan's current setup.
>>
>>  > How we determine the best match, since checking the prefix length
>>  > doesn't make sense anymore?
>>
>> it would still need to be on the longest match of any regexp and may get
>> tricky.
>>
>> -- juha
>>
>
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