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#!/usr/bin/env python3
# encoding: utf-8
"""
RegularExpressionStrings.py
Created by Graham Dennis on 2008-02-20.
Copyright (c) 2008-2012, Graham Dennis
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
import re
# integer regular expression string
integer = r'[-+]?[0-9]+'
# domain pair ( something, somethingElse) regular expression string
domainPair = r'\(\s*(\S+),\s*(\S+)\s*\)'
def integersInString(string):
"""
Return a list of the integers in `string`.
"""
integerRegex = re.compile(r'\b' + integer + r'\b')
results = integerRegex.findall(string)
# Convert captured strings into integers
return [int(result) for result in results]
def integerInString(string):
"""
Return the single integer in `string`.
If there is more than one integer in this string (as determined by `integersInString`),
this method will raise a `ValueError` exception.
"""
results = integersInString(string)
if len(results) > 1:
raise ValueError('Too many integers')
elif len(results) == 0:
raise ValueError('No integers found')
return results[0]
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