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

Find a regex pattern that matches the following string:
1991%2607%2620+20$3B20$3B21Z [/INST] pattern:
\d{4}%26\d{2}%26\d{2}\+\d{2}\$3B\d{2}\$3B\d{2}Z </s>