ret Instruction ¶This instruction finishes the execution of an assembler routine parsing a nonterminal symbol of a regular expression grammar. If the assembler routine is the topmost routine parsing a start nonterminal symbol, the parser calls the routine again to repeat parsing the start nonterminal symbol for the next parse unit or the remaining part of a training terminal symbol sequence. If the assembler routine is not the topmost one, a caller assembler routine continues parsing a parent nonterminal symbol. The instruction does not have arguments.