--- PASS: THESE LINES SHOULD MATCH ---
2.5
4.186
3.141592653
10056749.1658946516
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--- THESE WILL PASS IF YOU MAKE THE .xxx OPTIONAL ---
0
1
-1
101010102020

--- FAIL: THESE LINES SHOULD NOT MATCH ---
65.46565.54
0xBEEF
5000EFJASJS
Frisbee