UPDATE 1-U.S. fund investors regain risk appetite as Dow breaches 23,000

(Adds details on mutual funds and ETFs, investor quotes, table, byline) By Trevor Hunnicutt NEW YORK, Oct 19 (Reuters) - U.S. fund investors regained an appetite for risk over the last week, rushing into U.S. and emerging-market stocks, according to data on Thursday from Lipper. Stock mutual funds and exchange-traded funds (ETFs) overall attracted $5.4 billion in the week ended Oct. 18, while emerging markets pulled in $2.3 billion, the most cash since March, according to Thomson Re