#!/bin/bash
fldrs="TINKER_more05_less23 TINKER_more23_less03 TINKER_more55_less218"
for f in $fldrs; do
 name=$(echo "$f" | sed -E 's/TINKER_more([0-9]+)_less([0-9]+)/TINKER_\1_\2/');
 echo "$name"
done