#!/bin/bash
s="make_pair(obj1[I].get<1>(), obj2[I].get<2>());"
sed -E 's/([[:alnum:]]*(\[[[:alnum:]]*])*)\.get(<[^><]*>)\(\)/get\3(\1)/g' <<< "$s"
IyEvYmluL2Jhc2gKcz0ibWFrZV9wYWlyKG9iajFbSV0uZ2V0PDE+KCksIG9iajJbSV0uZ2V0PDI+KCkpOyIKc2VkIC1FICdzLyhbWzphbG51bTpdXSooXFtbWzphbG51bTpdXSpdKSopXC5nZXQoPFtePjxdKj4pXChcKS9nZXRcMyhcMSkvZycgPDw8ICIkcyI=