@Pattern with Unicode script \\p{L}* doesn't work

Question

I have problem with javax.validation.constraints.Pattern @Pattern validation.

@Pattern(regexp = "\\p{L}*", message = "Msg")
private String name;

When I'm trying to input any text it doesn't work.

When I used:

@Pattern(regexp = "[a-zA-Z]*", message = "Msg")

It works great with non latin characters.

What text do you type? Note that the pattern here is anchored, you may only type letters. To allow, e.g. spaces, too, use `[\\p{L}\\s]*`. — Wiktor Stribiżew, Nov 08 '16 at 10:07
I'm typing in froms text and validator returns me validation error. — Tomasz Gutkowski, Nov 08 '16 at 10:09
When I use: 'regexp = "[a-zA-Z]*' it works good with: "abc" but It doesn't work with Latin characters. — Tomasz Gutkowski, Nov 08 '16 at 10:12
@WiktorStribiżew Yeah. It's work. Thank you. What does it mean: (?U) — Tomasz Gutkowski, Nov 08 '16 at 11:43
I have posted the suggestion as an answer with explanation and a reference link. — Wiktor Stribiżew, Nov 08 '16 at 11:44

score 1 · Accepted Answer · answered Nov 08 '16 at 11:45

You need to make the \p{L} pattern Unicode aware with the Pattern.UNICODE_CHARACTER_CLASS flag.

Enables the Unicode version of Predefined character classes and POSIX character classes.

Since you are using the string pattern, you may use the inline (embedded) flag variant, (?U):

regexp = "(?U)\\p{L}*"

1 Answers1