src/vs/editor/common/model/textModelSearch.ts/Searcher/constructor
class Searcher:	constructor(wordSeparators: WordCharacterClassifier | null, searchRegex: RegExp,) {
		this._wordSeparators = wordSeparators;
		this._searchRegex = searchRegex;
		this._prevMatchStartIndex = -1;
		this._prevMatchLength = 0;
	}