Regular expression not working for at least one European character

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You just need to remove the anchors and the quantifier and use test:

alert(/(?![×÷])[A-Za-zÀ-ÿ]/.test("ß1111"))
alert(/(?![×÷])[A-Za-zÀ-ÿ]/.test("ö"))
alert(/(?![×÷])[A-Za-zÀ-ÿ]/.test("12345"))

The (?![×÷])[A-Za-zÀ-ÿ] regex is an adaptation of the regex provided in Useful ASCII Ranges. It will capture all Latin and accented characters.

Some more language-related character ranges you can use:

French Letters: [a-zA-ZàâäôéèëêïîçùûüÿæœÀÂÄÔÉÈËÊÏΟÇÙÛÜÆŒ]

German Letters: [a-zA-ZäöüßÄÖÜ]

Polish Letters only: [a-pr-uwy-zA-PR-UWY-ZąćęłńóśźżĄĆĘŁŃÓŚŹŻ] (Note that there is no Q, V and X in Polish, but if you want to allow all English letters as well, use [a-zA-ZąćęłńóśźżĄĆĘŁŃÓŚŹŻ])

Italian Letters: [a-zA-ZàèéìíîòóùúÀÈÉÌÍÎÒÓÙÚ]

Spanish Letters: [a-zA-ZáéíñóúüÁÉÍÑÓÚÜ]

And some more…

Swedish: [a-zA-ZäöåÄÖÅ] (link)

Norwegian: [a-zA-ZæøåÆØÅ] (link)

Danish (same as Norwegian): [a-zA-ZæøåÆØÅ] (link)

Greek & Coptic + Greek Extended: [\u0370-\u03FF\u1F00-\u1FFF] (link)

Russian: [а-яА-ЯёЁ] (link)

Ukrainian: [а-щА-ЩЬьЮюЯяЇїІіЄєҐґ] (link)

Serbian (Cyrillic): [А-ИК-ШЂЈ-ЋЏа-ик-шђј-ћџ] (link)

Bulgarian (subset of Russian alphabet): [а-ъьюяА-ЪЬЮЯ] (link)

Belarusian script range: [ёа-зй-шы-яЁА-ЗЙ-ШЫІіЎў] (link)

Romanian: [a-zA-ZĂÂÎȘȚăâîșț] (link)

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