How to match uppercase word character with regex in PHP?

Question

I know there is the [A-Z] notation.. but I am not sure if [a-z] is the same as \w.

I'd like to match \w, but only if it's uppercase.

This should include all the weird characters like Ę, Ą, Ś, Ć, Ź, Ż, Ś, Ł, Ó, Ń.

Answer 1

You can use Unicode character properties. For example,

'/\p{Lu}/u'

Will match any uppercase letter.

Answer 2

\w is equivalent of this character class:

[a-zA-Z0-9_]

If you want upper case unicode characters only then use this character class:

'/[\p{Lu}\p{N}_]/u'

This will match any one of:

1. Upper case unicode letter
2. unicode number
3. Underscore