Character string detection method and device

The invention discloses a character string detection method and device, and the method comprises the steps: sequentially determining each character in a second character string as a target character, and executing the following processing for the target character until each character in the second character string is processed. Obtaining a matching character string corresponding to the target character; the matching character string is composed of binary characters indicating a matching result; the first to Nth matching results are matching results obtained by matching the target character with the first to Nth characters of the first character string; successful matching corresponds to 1; the matching failure corresponds to 0. And constructing an operation character string. The matching character string corresponding to the target character and the operation character string corresponding to the target character are subjected to bitwise AND operation, a result character string corresponding to the target cha