Worksheet does not match UTF8 letters for cell names

[cekaon]

PhpSpreadsheet/src/PhpSpreadsheet/Worksheet/Worksheet.php

Line 1268 in 06d2682

preg_match('/^' . Calculation::CALCULATION_REGEXP_DEFINEDNAME . '$/i', $coordinate)

Can you update the preg_match regexp to allow UTF8 characters for cell names? If I load excel with named cells, I am not able to read name e.g. Caché, because \p{L} does not work correctly if UTF8 is not defined at start of the preg_match in PHP.

The line 1268 should be:
preg_match('/(*UTF8)^' . Calculation::CALCULATION_REGEXP_DEFINEDNAME . '$/i', $coordinate)

[cekaon]

Example

This does not work:
preg_match("/^([\p{L}]*)$/i", "Caché");

But this work correctly:
preg_match("/(*UTF8)^([\p{L}]*)$/i", "Caché");

[MarkBaker]

Fixed, although using the /u switch rather than (*UTF8) for consistency with the rest of the codebase

[cekaon]

Thank you sir.