function createRegExpForIgnorePatterns(normalizedOptions) {
	Object.keys(normalizedOptions).forEach(key => {
		const ignorePatternStr = normalizedOptions[key].ignorePattern;

		if (ignorePatternStr) {
			const regExp = RegExp(`^\\s*(?:${ignorePatternStr})`, "u");

			normalizedOptions[key].ignorePatternRegExp = regExp;
		}
	});
}
Creates a regular expression for each ignorePattern defined in the rule
options.

This is done in order to avoid invoking the RegExp constructor repeatedly.
@param {Object} normalizedOptions The normalized rule options.
@returns {void}