Regular Expressions 101

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/
\A\p{L}+\z
/
u
\A asserts position at start of the string
\p{L}
matches any kind of letter from any language
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\z asserts position at the end of the string
Global pattern flags
u modifier: unicode. Pattern strings are treated as UTF-16. Also causes escape sequences to match unicode characters
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
u

Test String