Function slugify

Source

export function slugify( input: string, args: Partial<slugify.Args> = {} ): string {

    const {
        allowRepeatDashes = false,
        allowUnderscores = false,
    } = args;

    const allowRepeatUnderscores = args.allowRepeatUnderscores ?? allowRepeatDashes;

    let slug: string = input.toLowerCase();

    // replace accented letters
    slug = slug.replace( /(À|Á|Â|Ä|Ã|Æ|Å|Ā|à|á|â|ä|ã|æ|å|ā)/gi, 'a' );
    slug = slug.replace( /(È|É|Ê|Ë|Ē|Ė|Ę|è|é|ê|ë|ē|ė|ę)/gi, 'e' );
    slug = slug.replace( /(Î|Ï|Í|Ī|Į|Ì|î|ï|í|ī|į|ì)/gi, 'i' );
    slug = slug.replace( /(Ô|Ö|Ò|Ó|Œ|Ø|Ō|Õ|ô|ö|ò|ó|œ|ø|ō|õ)/gi, 'o' );
    slug = slug.replace( /(Û|Ü|Ù|Ú|Ū|û|ü|ù|ú|ū)/gi, 'u' );
    slug = slug.replace( /(Ñ|Ń|ñ|ń)/gi, 'n' );

    // change ampersands to 'and'
    slug = slug.replace( /(\s)&+(\s)/gi, '$1and$2' );

    // remove non-letters & non-digits (except spaces & some punctuation, 
    // which will become dashes)
    slug = slug.replace( /[^\s|a-z|\d|\n|\-|–|—|_|\:|\;|\/]+/gi, '' );

    // and now everything else is a dash!
    if ( allowUnderscores ) {
        slug = slug.replace( /[^\d|a-z|_]+/gi, '-' );
    } else {
        slug = slug.replace( /[^\d|a-z]+/gi, '-' );
    }

    // remove leading/trailing "whitespace"
    slug = slug.replace( /(^[\n|\s|\-|_]+|[\n|\s|\-|_]+$)/gi, '' );

    // remove multi-dashes
    if ( !allowRepeatDashes ) {
        slug = slug.replace( /-+/gi, '-' );
    }

    // remove multi-underscores
    if ( allowUnderscores && !allowRepeatUnderscores ) {
        slug = slug.replace( /_+/gi, '_' );
    }

    return slug;
}
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