if (this.maxSpan && (!this.maxDate || this.startDate.clone().add(this.maxSp...

    // > - the question mark ?,
    // > - the asterisk or star *,
    // > - the plus sign +,
    // > - the opening parenthesis (,
    // > - the closing parenthesis ),
    // > - and the opening square bracket [,
    // > - the opening curly brace {,
    // > These special characters are often called "metacharacters".
    [
        /[\\$.|*+(){^]/g,
        match => `\\${match}`
    ],

    [