Find all files (type f) and execute a sed command to replace any 5-character string followed by a 10-character string with the 5-character string followed by **REDACTED**.
find . -type f -exec sed -i 's/\(\S\S\S\S\S\) \b\S\S\S\S\S\S\S\S\S\S\S\b/\1 **REDACTED**/g' {} \;