Es |regnode*|regclass |NN struct RExC_state_t *state|U32 depth
ERsn |I32 |regcurly |NN const char *
Es |regnode*|reg_node |NN struct RExC_state_t *state|U8 op
+Es |UV |reg_recode |const char value|NULLOK SV **encp
Es |regnode*|regpiece |NN struct RExC_state_t *state|NN I32 *flagp|U32 depth
Es |regnode*|reg_namedseq |NN struct RExC_state_t *state|NULLOK UV *valuep
Es |void |reginsert |NN struct RExC_state_t *state|U8 op|NN regnode *opnd|U32 depth