Some improvment

SSnR.py

@@ -35,19 +35,37 @@ def main():
 	parser.add_argument('-s', '--string', help='String', required=True)
 	args = vars(parser.parse_args())
 
-	search(args["regex"], args["string"])
+	# Compile regex
+	try:
+		ex = compile_regex(args["regex"])
+	except SyntaxError as exception:
+		print("Error when compiling regex: " + str(exception))
+		return -1
+	except regex.error as exception:
+		print("Error when compiling regex: " + exception.msg)
+		return -1
+
+	search(ex, args["string"])
 	return 0
 
+def compile_regex(ex):
+	"""
+	Compile regex
+		:param ex: Regular expression
+	"""
+	regex_compile = regex.compile(ex, regex.MULTILINE)
+	if regex_compile is None:
+		raise SyntaxError('Error in the regex')
+	else:
+		return regex_compile
+
 def search(ex, string):
 	"""
 	Search in a string
 		:param ex: Regular expression
 		:param string: A string
 	"""
-	regex_compile = regex.compile(ex, regex.MULTILINE)
+	ite = ex.finditer(string)
-	if regex_compile is None:
-		return -1
-	ite = regex_compile.finditer(string)
 	nb_match = 0
 	for match in ite:
 		nb_match += 1