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

Find a regex pattern that matches the following string:
1991$2F09$2F14T01$3C05$3C22Z [/INST] pattern:
\d{4}\$2F\d{2}\$2F\d{2}T\d{2}\$3C\d{2}\$3C\d{2}Z </s>