C++ and JS RegEx equivalent of \p{L}

Question

I need to match all unicode characters in Email Addresses. I could do this validation in Java using \p{L}. Is there any \p{L} equivalent in JS and C++ ?

If not which is the best reliable open source library which provides this capability in C++ and JavaScript ?

You can find it [here](http://stackoverflow.com/questions/37470212/match-any-non-word-character-excluding-diacritics/37471102#37471102). In C++, you will need to use `wregex`, remember? :) Why haven't you accepted the previous answer? — Wiktor Stribiżew, Jun 23 '16 at 14:29
@ThomasAyoub: Default flavor `std::regex` uses is ECMAScript. Although it is a bit different from JS implementation. — Wiktor Stribiżew, Jun 23 '16 at 14:33
@Wiktor No need for `wregex` at all, `std::regex` can handle Unicode encodings just fine. — Konrad Rudolph, Jun 23 '16 at 14:41
@KonradRudolph: Then post an example and let me know how to use it in the Visual Studio 2012 C++ project. — Wiktor Stribiżew, Jun 23 '16 at 15:05
@WiktorStribiżew VS2012? No idea. You didn’t mention that you were on a non-compliant compiler. A *compliant* compiler handles it. — Konrad Rudolph, Jun 23 '16 at 15:09
@WiktorStribiżew To use wregex I need to convert my basic string to wstring. What is the easy way for that ? I think the following code will work for only when the basic string consists of ASCII charcters --------------std::wstring wstring(str.begin(), str.end()); — vijin, Jun 23 '16 at 17:56
>std::wstring ws(L"test"); std::string str(ws.begin(), ws.end()); std::wsmatch wm;std::wregex reg(L"[\\\\p{L]+"); if (regex_match(ws.cbegin(), ws.cend(), wm, reg)) { return true; } else { return false; } ' This is returning false always ! — vijin, Jun 23 '16 at 18:34
You seem to forget that ECMAScript does not support Unicode category classes. — Wiktor Stribiżew, Jun 23 '16 at 18:35
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/115440/discussion-between-vijin-and-wiktor-stribizew). — vijin, Jun 23 '16 at 18:39
I tried your suggestion in JS. var XRegExp = require('xregexp'); this.REGEXP_EMAIL_INT_LOCAL_PART = XRegExp('^[//p{L}0-9!#$%&\'*+/=?^_`{|}~\.-]*$'); But this shows error : require is not defined. — vijin, Jun 24 '16 at 18:55

score 3 · Accepted Answer · answered Jun 23 '16 at 21:39

ECMAScript, as well as all other flavors supported by the std::regex, does not support Unicode properties (Unicode category classes). JavaScript has this support neither.

As a workaround, use Boost library in C++ and XRegExp library in JavaScript.

In Boost, declare the regex as follows:

boost::wregex reg(L"^\\p{L}+$");

Note that ^\p{L}+$ matches 1+ letter strings only.

A JS example:

var str = "bębnić";
regex = XRegExp('^\\p{L}+$');
console.log(regex.test(str));

<script src="https://cdnjs.cloudflare.com/ajax/libs/xregexp/2.0.0/xregexp-all-min.js"></script>

C++ and JS RegEx equivalent of \p{L}

1 Answers1