# coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility
import re
regex = r"^(?=(?:\d,?){1,10}(?:\.\d{2})?$)[0-9]{1,3}(?:,[0-9]{3})*(?:\.[0-9]+)?$"
test_str = ("I want to make sure that the input is no more than 10 digits before the decimals point so it will match DECIMAL(12,2).\n\n"
"I already tried :\n\n"
"^(?=.{0,13}$)[0-9]{1,3}(,[0-9]{3})*(\\.[0-9]+)?$\n"
"But it counts the digits after decimals too, so what I want to match is:\n\n"
"1,111,111,111.00\n\n"
"so it will keep matching with or without the decimals, what I tried only can match with:\n\n"
"1,111,111,111\n\n"
"111,111,111.00\n\n"
"1,111,111,111,1.00")
matches = re.finditer(regex, test_str, re.MULTILINE)
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