Counting regex pattern matches in one line using sed or grep?

Question

I want to count the number of matches there is on one single line (or all lines as there always will be only one line).

I want to count not just one match per line as in

Answer 1

Why not use awk? You could use awk '{print gsub(your_regex,"&")}' to print the number of matches on each line, or awk '{c+=gsub(your_regex,"&")}END{print c}' to print the total number of matches. Note that relative speed may vary depending on which awk implementation is used, and which input is given.