Fix French PhoneNumber regexp

[michalbundyra]

Fixes #85

[froschdesign]

Is there a reason why the regex pattern differs from the Google library? Or did I miss something?

<nationalNumberPattern>
700\d{6}|
(?:
  6\d|
  7[3-9]
)\d{7}
</nationalNumberPattern>

https://github.com/google/libphonenumber/blob/v8.10.19/resources/PhoneNumberMetadata.xml#L9361-L9367

[michalbundyra]

@froschdesign The result is the same:

• in google library we have: a|((b|c)d)
• in PR we have a|e|f, where e = bd and f = cd.

[froschdesign]

It is this same result, but why not copy the pattern from the reference?

I want to go one step further: we need an update script for all regex patterns because there are more old and outdated patterns in this library. This means, it would result in copying.

[michalbundyra]

Can we use it as the reliable source for all patterns? If so we can write a simple script to update patters, because right now I am super confused with so many regexp... For example I've also noted that we have more rules/countries in the library than it is in the google (we do have XK - Kosovo, and it is not present there).

[froschdesign]

Or we simplify the process and use an external library: libphonenumber for PHP

[michalbundyra]

@froschdesign I guess, it will be for v3 - where we can change the approach completely, use the external library or use reliable source for all patterns.