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

Find a regex pattern that matches the following string:
1991%5E10%5E26T13:36:27Z [/INST] pattern:
\d{4}%5E\d{2}%5E\d{2}T\d{2}:\d{2}:\d{2}Z </s>