fix syntax error in regular expression
fix syntax error in regular expression

moses-smt/mosesdecoder,moses-smt/mosesdecoder,alvations/mosesdecoder,alvations/mosesdecoder,moses-smt/mosesdecoder,alvations/mosesdecoder,alvations/mosesdecoder,alvations/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,alvations/mosesdecoder,alvations/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,alvations/mosesdecoder,alvations/mosesdecoder,alvations/mosesdecoder,alvations/mosesdecoder,moses-smt/mosesdecoder