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Regular Expression
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^\w+
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Input 1
1
New
\w = [\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Lm}\p{Nd}\p{Nl}\p{No}\p{Pc}] (the \p{Mn} is not included as in .NET regex) ﬔąфrｗ𝐚𝒇𝓌𝔨𝕨𝗐𝛌𝛚ὣỷᵺᴔᴉվԍӹӡҁʫ - Ll, lowercase letters (some) AÂĞƎƗNJΔΘΣϢЉЩѬӲԽႵᎿᏉᏯԌℬⰏＲ𝐖 - Lu, uppercase letters (some) DžLjNjDzᾈᾉᾊᾋᾌᾍᾎᾏᾘᾙᾚᾛᾜᾝᾞᾟᾨᾩᾪᾫᾬᾭᾮᾯᾼῌῼ - Lt, titlecase letters (all) ǃºऌߩהײبܢ - Lo, other letters (some) (note regex101 highlighting is weird here) ʰʷˇˣߴߵໆᱽᵂᵒᵝᶣₐ〱ꀕꜛｰ - Lm, Modifier letters (some) e҇c͢ą Mn, nonspacing mark 09١٨߁߈੮୪௨௫൫๕༥៨᧕᱕５ Nd, decimal digit number (some) Ⅲᛯⅷ𒑣 - Nl, letter number ¼৶౼൵፫⁹⅙ - No, other number _‿⁀⁔︳︴﹍﹎﹏＿ Only a _ from \p{Pc}, connector punctuation (.NET matches all of them)