(CommandList children: [ (FuncDef name: validAlphaNum body: (BraceGroup children: [ (Assignment keyword: Assign_None pairs: [ (assign_pair lhs: (LhsName name:validchars) op: Equal rhs: { (DQ (CommandSubPart command_list: (CommandList children: [ (Pipeline children: [ (C {(echo)} {($ VSub_Number '$1')}) (C {(sed)} {(-e)} {(SQ <'s/[^[:alnum:]]//g'>)}) ] negated: F ) ] ) left_token: <Left_CommandSub '$('> spids: [27 41] ) ) } spids: [25] ) ] spids: [25] ) (If arms: [ (if_arm cond: [ (Sentence child: (C {(Lit_Other '[')} {(DQ ($ VSub_Name '$validchars'))} {(Lit_Other '=')} {(DQ ($ VSub_Number '$1'))} {(Lit_Other ']')} ) terminator: <Op_Semi ';'> ) ] action: [(ControlFlow token:<ControlFlow_Return return> arg_word:{(0)})] spids: [16777215 64] ) ] else_action: [(ControlFlow token:<ControlFlow_Return return> arg_word:{(1)})] spids: [72 80] ) ] spids: [14] ) spids: [10 13] ) ] )