public findPreviousMatch(searchString:string, rawSearchStart:editorCommon.IPosition, isRegex:boolean, matchCase:boolean, wholeWord:boolean): editorCommon.IEditorRange {
		if (this._isDisposed) {
			throw new Error('Model.findPreviousMatch: Model is disposed');
		}

		var regex = strings.createSafeRegExp(searchString, isRegex, matchCase, wholeWord);
		if (!regex) {
			return null;
		}

		var searchStart = this.validatePosition(rawSearchStart),
			lineCount = this.getLineCount(),
			startLineNumber = searchStart.lineNumber,
			text: string,
			r: editorCommon.IEditorRange;

		// Look in first line
		text = this._lines[startLineNumber - 1].text.substring(0, searchStart.column - 1);
		r = this._findLastMatchInLine(regex, text, startLineNumber);
		if (r) {
			return r;
		}

		for (var i = 1; i <= lineCount; i++) {
			var lineIndex = (lineCount + startLineNumber - i - 1) % lineCount;
			text = this._lines[lineIndex].text;
			r = this._findLastMatchInLine(regex, text, lineIndex + 1);
			if (r) {
				return r;
			}
		}

		return null;
	}

	private _rangeIsMatch(range:editorCommon.IEditorRange): boolean {
		let selection = this._editor.getSelection();
		let selectionText = this._editor.getModel().getValueInRange(selection);
		let regexp = strings.createSafeRegExp(this._state.searchString, this._state.isRegex, this._state.matchCase, this._state.wholeWord);
		let m = selectionText.match(regexp);
		return (m && m[0].length === selectionText.length);
	}

	public findMatches(searchString:string, rawSearchScope:any, isRegex:boolean, matchCase:boolean, wholeWord:boolean, limitResultCount:number = LIMIT_FIND_COUNT): editorCommon.IEditorRange[] {
		if (this._isDisposed) {
			throw new Error('Model.findMatches: Model is disposed');
		}

		var regex = strings.createSafeRegExp(searchString, isRegex, matchCase, wholeWord);
		if (!regex) {
			return [];
		}

		var searchRange:editorCommon.IEditorRange;
		if (Range.isIRange(rawSearchScope)) {
			searchRange = rawSearchScope;
		} else {
			searchRange = this.getFullModelRange();
		}

		return this._doFindMatches(searchRange, regex, limitResultCount);
	}