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Regular expression to match non-ASCII characters?

... Unicode Property Escapes are among the features of ES2018. Basic Usage With Unicode Property Escapes, you can match a letter from any language with the following simple regular expression: /\p{Letter}/u Or with the shorthand, even terser: /\p{L}/u Matching Words Regarding the...
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What are the undocumented features and limitations of the Windows FINDSTR command?

...tion has no effect if the output is redirected to a file or piped. See the 2018-08-18 edit in Aacini's answer for a description of the buggy behavior when output is redirected to CON. Most control characters and many extended ASCII characters display as dots on XP FINDSTR on XP displays most non-pri...