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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | 1x 1x 3x 3x 3x 20x 20x 17x 15x 7x 7x 7x 20x 7x 7x 20x 1x 1x 12x 20x 3x 3x | /**
* Regular expression matching common English articles, conjunctions, and prepositions for title casing.
* @internal
*/
const titles = /^(a|an|and|as|at|but|by|en|for|if|in|nor|of|on|or|per|the|to|vs?\.?|via)$/iu;
/**
* Convert a string to a title, capitalizing each word, except for the small words
* @param input - the string to make title case
* @returns the string in title case
* @group String
* @category Case Conversion
*/
export function titleCase(input: string): string {
return input.replaceAll(
/[A-Za-z0-9\u00C0-\u00FF]+[^\s-]*/gu,
(match, index: number, word: string) => {
if (
index > 0 &&
index + match.length !== word.length &&
match.search(titles) > -1 &&
word.charAt(index - 2) !== ':' &&
(word.charAt(index + match.length) !== '-' || word.charAt(index - 1) === '-') &&
word.charAt(index - 1).search(/[^\s-]/u) < 0
) {
return match.toLocaleLowerCase();
}
if (match.slice(1).search(/[A-Z]|\../u) > -1) {
return match;
}
return match.charAt(0).toLocaleUpperCase() + match.slice(1);
},
);
}
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