<s>[INST] <<SYS>>
You are an expert in regular expressions (regex)
<</SYS>>

Find a regex pattern that matches the following string:
2012%2508%2507 03%5F34%5F21 [/INST] pattern:
\d{4}%25\d{2}%25\d{2}\ \d{2}%5F\d{2}%5F\d{2} </s>