Regular Expressions
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Regular expressions are used for matching text.
You can test regular expressions online at [1].
Syntax
Letters
[a-zA-Z]
Numbers
You should match numbers using [0-9].
\d will match unicode characters which are classified as digits.
See \d vs 0-9
Useful Regular Expressions
Mostly copied from Regex DB.
Floating Point Number
Without matching scientific notation (e.g. 1.5e-6). Reference
[-+]?[0-9]*\.?[0-9]+
With matching scientific notation (e.g. 1.5e-6).
Reference
Capturing significand and exponent separately.
([-+]?[0-9]*\.?[0-9]+)(?:[eE]([-+]?[0-9]+))?
Capturing the entire string together.
([-+]?[0-9]*\.?[0-9]+(?:[eE][-+]?[0-9]+)?)