Improve command line arguments handling

SSnR.py

@@ -23,45 +23,26 @@
 #
 
 import sys
-import getopt
+import argparse
 import regex
 
-def main(args):
+def main():
 	"""
 	Main function
-		:param args: Main arguments
 	"""
-	try:
-		opts, args = getopt.getopt(args, "hr:s:", ["regex=", "string=", "help"])
-	except getopt.GetoptError as err:
-		print(err)
-		print_help()
-		return 2
+	parser = argparse.ArgumentParser(description='Search and replace tool', prog='SSnR')
+	parser.add_argument('-r', '--regex', help='Regex', required=True)
+	parser.add_argument('-s', '--string', help='String', required=True)
+	args = vars(parser.parse_args())
 
-	string = ""
-	ex = ""
-
-	for opt, arg in opts:
-		if opt in ("-h", "--help"):
-			print_help()
-			return 0
-		elif opt in ("-r", "--regex"):
-			ex = arg
-		elif opt in ("-s", "--string"):
-			string = arg
-
-	if (string == "") or (ex == ""):
-		print_help()
-		return -2
-
-	search(ex, string)
+	search(args["regex"], args["string"])
 	return 0
 
 def search(ex, string):
 	"""
 	Search in a string
-		:param ex: regular expression
-		:param string: a string
+		:param ex: Regular expression
+		:param string: A string
 	"""
 	regex_compile = regex.compile(ex, regex.MULTILINE)
 	if regex_compile is None:
@@ -74,9 +55,6 @@ def search(ex, string):
 		      ":" + str(match.end(0)) + "]")
 	print("Number of match: " + str(nb_match))
 
-def print_help():
-	print('SSnR.py -s <string> -r <regex>')
-
 
 if __name__ == '__main__':
-	sys.exit(main(sys.argv[1:]))
+	sys.exit(main())