Abstract: A symbol string pattern recognition equipment for use in a pattern data processing system employs sequential logics to perform simultaneous comparison of respective symbol string patterns and standard symbol patterns. The equipment includes an external signal generating circuit for generating respective symbols constituting a symbol string pattern in the form of a string of binary-coded external signals. At least one internal signal generating circuit generates an internal signal upon initiation of the supply of the symbol string pattern. A plurality of sequential logic circuits are connected to the internal signal generating circuit and control the travelling paths of the internal signal. A gate circuit is connected between each of the sequential logic circuits and adapted to be turned on upon completion of the supply of the symbol string pattern. An external shift register is connected to the gate circuit, and a circuit for detecting the internal signal is connected to the external shift register.