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

Answer 1

\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