let testParse = (input: string, expectedPieces: ReplacePiece[]) => {
let actual = parseReplaceString(input);
let expected = new ReplacePattern(expectedPieces);
assert.deepEqual(actual, expected, 'Parsing ' + input);
};
test('issue #19740 Find and replace capture group/backreference inserts `undefined` instead of empty string', () => {
let replacePattern = parseReplaceString('a{$1}');
let matches = /a(z)?/.exec('abcd');
let actual = replacePattern.buildReplaceString(matches);
assert.equal(actual, 'a{}');
});
private _getReplacePattern(): ReplacePattern {
if (this._state.isRegex) {
return parseReplaceString(this._state.replaceString);
}
return ReplacePattern.fromStaticValue(this._state.replaceString);
}