Jan 19 (Reuters) - Bank Islami Pakistan BIPL.KA , the country&aposs second-largest full-fledged Islamic bank, has received regulatory approval to study the acquisition of KASB Bank Limited KASB.KA .Last week, Bank Islami&aposs board of directors approved a plan to raise 3.5 billion rupees ($34.8 million) via subordinated Islamic bonds to fund its expansion strategy. ID:nL6N0UT13ZAn acquisition cou