Checking for diacritics with a regular expression

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You can use the specific Unicode escape for letters – \p{L} (this will include the A-Za-z ranges):

^[.\p{L}]*$

See on regularexpressions.info:

\p{L} or \p{Letter}

Matches a single Unicode code point that has the property “letter”. See Unicode Character Properties in the tutorial for a complete list of properties. Each Unicode code point has exactly one property. Can be used inside character classes.

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