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

Find a regex pattern that matches the following string:
2000$2008$2004T23:45:39.321Z [/INST] pattern:
\d{4}\$20\d{2}\$20\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z </s>