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validator.js isAlphanumeric el-GR rejects accented Greek that isAlpha accepts
isAlpha('el-GR') uses the Greek range [Α-ώ] (U+0391–U+03CE) but isAlphanumeric('el-GR') still ends at ω ([0-9Α-ω], U+03C9). So isAlphanumeric rejects ό, ύ, ώ and the uppercase Ό/Ύ/Ώ even though isAlpha accepts them, and common words like νερό or πρώτα pass isAlpha but fail isAlphanumeric.
Other categories
IME compositionKana / romajiWidth / normalizationSurrogate & graphemeSegmentation / word countNumeralsLocale dataRegex roundtripCodegen escapeEncoding & BOM
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