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

Find a regex pattern that matches the following string:
1994$5F12$5F12 20:37:54.211Z [/INST] pattern:
\d{4}\$5F\d{2}\$5F\d{2}\ \d{2}:\d{2}:\d{2}\.\d{3}Z </s>