Regular Expressions Matching Simple Patterns Match any float
Example
[\+\-]?\d+(\.\d*)?
This will match any signed float, if you don't want signs or are parsing an equation remove [\+\-]? so you have \d+(\.\d+)?
Explanation:
\d+matches any integer()?means the contents of the parentheses are optional but always have to appear together- '\.' matches '.', we have to escape this since '.' normally matches any character
So this expression will match
5
+5
-5
5.5
+5.5
-5.5
