diff -r dd94b9a68c61 -r 92932cd370a4 plcopen/plcopen.py
--- a/plcopen/plcopen.py	Tue Aug 15 16:01:18 2017 +0300
+++ b/plcopen/plcopen.py	Tue Aug 15 16:48:49 2017 +0300
@@ -139,12 +139,12 @@
     test_result = []
     result = criteria["pattern"].search(text)
     while result is not None:
-        prev_pos=result.endpos
+        prev_pos = result.endpos
         start = TextLenInRowColumn(text[:result.start()])
         end = TextLenInRowColumn(text[:result.end() - 1])
         test_result.append((start, end, "\n".join(lines[start[0]:end[0] + 1])))
         result = criteria["pattern"].search(text, result.end())
-        if result is not None and prev_pos==result.endpos:
+        if result is not None and prev_pos == result.endpos:
             break
     return test_result