@technobuddha/library
Version:
A large library of useful functions
29 lines • 2.48 kB
JavaScript
/**
* 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) {
return input.replaceAll(/[A-Za-z0-9\u00C0-\u00FF]+[^\s-]*/gu, (match, index, word) => {
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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