Why Doesn't My PHP Regex Match Unicode Characters?

Unicode Letter Character Matching in PCRE/PHP

In an attempt to validate names in PHP, a pattern is implemented utilizing the following regex:

/^([\p{L}'\- ])+$/

However, the validation fails to match Unicode characters such as Ă or 张.

Analysis

The issue stems from the omission of the "u" modifier in the regex. This modifier is necessary to enable Unicode character matching and avoid confusion with ASCII-only patterns.

By modifying the pattern to include the "u" modifier:

/^[-\' \p{L}]+$/u

the regex can now correctly match Unicode letter characters, as well as apostrophes, hyphens, and spaces.

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