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

Find a regex pattern that matches the following string:
2021$2E01$2E21 17$2D47$2D20.249 [/INST] pattern:
\d{4}\$2E\d{2}\$2E\d{2}\ \d{2}\$2D\d{2}\$2D\d{2}\.\d{3} </s>