# coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility
import re
regex = r"(?<=Amount Due|Pay This Amount|Total Balance|Total Current Month’s Charges|Amount Now Due|Amount Due|Amount due on|Total Balance on)\s+(\w+)?\s?\$([\d.,]+)"
test_str = ("Pay this amount $45.50\n\n"
"Pay this amount due Mar04 $56.67 → Does not work with current expression\n\n"
"Amount due $56.78 → works with current expression\n\n"
"Amount due on dec4 $76.45 → does not work with current expression\n\n"
"Total balance $76.45 → works with current expression\n\n"
"Total balance on apr3 $64.34")
matches = re.finditer(regex, test_str, re.MULTILINE | re.IGNORECASE)
for matchNum, match in enumerate(matches, start=1):
print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group()))
for groupNum in range(0, len(match.groups())):
groupNum = groupNum + 1
print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum)))
# Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Python, please visit: https://docs.python.org/3/library/re.html