All files / util/src/strings util.ts

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const LETTER_REGEX = /(\p{Letter}|\d)/u;
const WHITESPACE_REGEX = /\s/;
 
export type CharPredicate = (char: string) => boolean;
 
export const isLetter: CharPredicate = (char: string) => LETTER_REGEX.test(char[0]);
export const isWhitespace: CharPredicate = (char: string) => WHITESPACE_REGEX.test(char[0]);
export const isPunctuation: CharPredicate = (char: string) => !isLetter(char) && !isWhitespace(char);