Using regex for multiple lines

Question

What is the best way of extracting expressions for the following lines using regex:

Sigma 0.10 index = $5.00
beta .05=$25.00
.35 index (or $12.5)
Gamma 0.07

In any of the case, I want to extract the numeric values from each line (for example "0.10" from line 1) and (if available) the dollar amount or "$5.00" for line 1.

Answer 1

import re
s="""Sigma 0.10 index = $5.00
beta .05=$25.00
.35 index (or $12.5)
Gamma 0.07"""
print re.findall(r'[0-9$.]+', s)

Output:

['0.10', '$5.00', '.05', '$25.00', '.35', '$12.5', '0.07']

More strict regex:

print re.findall(r'[$]?\d+(?:\.\d+)?', s)

Output:

['0.10', '$5.00', '$25.00', '$12.5', '0.07']

If you want to match .05 also:

print re.findall(r'[$]?(?:\d*\.\d+)|\d+', s)

Output:

['0.10', '$5.00', '.05', '$25.00', '.35', '$12.5', '0.07']

Answer 2

Well the base regex would be: \$?\d+(\.\d+)?, which will get you the numbers. Unfortunately, I know regex in JavaScript/C# so not sure about how to do multiple lines in python. Should be a really simple flag though.