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

Find a regex pattern that matches the following string:
1991%2506%2511 21%3B24%3B21.813 [/INST] pattern:
\d{4}%25\d{2}%25\d{2}\ \d{2}%3B\d{2}%3B\d{2}\.\d{3} </s>