Regex modifier /u in JavaScript?

Question

Recently I have created a regex, for my PHP code which allows only the letters (including special characters plus spaces), but now I\'m having a problem with converting it (

Answer 1

The /u modifier is for unicode support. Support for it was added to JavaScript in ES2015.

Read http://stackoverflow.com/questions/280712/javascript-unicode to learn more information about unicode in regex with JavaScript.

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Polish characters:

Ą \u0104
Ć \u0106
Ę \u0118
Ł \u0141
Ń \u0143
Ó \u00D3
Ś \u015A
Ź \u0179
Ż \u017B
ą \u0105
ć \u0107
ę \u0119
ł \u0142
ń \u0144
ó \u00F3
ś \u015B
ź \u017A
ż \u017C

All special Polish characters:

[\u0104\u0106\u0118\u0141\u0143\u00D3\u015A\u0179\u017B\u0105\u0107\u0119\u0142\u0144\u00F3\u015B\u017A\u017C]