How to Isolate the end of a string

[odd rover]

I have these strings that represent a fp number in hex and im trying to isolate the end and cast it into an int.
These are my strings.

-0x1.6e7ceep+14
0x1.01b2b2p-23

for example, I want my return value to be 14 and -23 respectively. How could I go about doing this?

[twin shard]

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[cinder granite]

You could either parse the string or loop it backwards, adding to an int the according value until you find a non-digit. If it's -, set the number to negative itself, ignoring the rest.