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--- teaching:labs:mdse:2013:bug_descriptions:jt-bug-cor103 [2013/10/14 10:05]
jaspreet_kaur
+++ teaching:labs:mdse:2013:bug_descriptions:jt-bug-cor103 [2018/05/09 01:59] (current)
@@ Line 1: / Line 1: @@
+====== Bug JT_Category_Number ======
+===== Inspired by =====
+  * [[http://findbugs.sourceforge.net/bugDescriptions.html#RE_BAD_SYNTAX_FOR_REGULAR_EXPRESSION | RE_BAD_SYNTAX_FOR_REGULAR_EXPRESSION]]
+===== Original Description =====
+The code here uses a regular expression that is invalid according to the syntax for regular expressions. This statement will throw a PatternSyntaxException when executed. -- 2013-10-14
+===== Detailed Description =====
+Syntax errors also called as parsing errors, are caught by ParseSyntaxException in Java whenever incorrect syntax is passed in any regular expression.
+===== Sample Problem Scenario =====
+<code Java>
+public class PatternExample {
+	public static void main(String[] args) {
+		Pattern pattern = Pattern.compile('.xx.');
+		Matcher matcher = pattern.matcher('MxxY');
+		System.out.println('Input String matches regex - '+matcher.matches());
+		// bad regular expression
+		pattern = Pattern.compile('*xx*');
+	}
+}
+</Code>
+===== Sample Fix =====
+<code Java>
+String str = 'bbb';
+System.out.println('Using String matches method: '+str.matches('.bb'));
+System.out.println('Using Pattern matches method: '+Pattern.matches('.bb', str));
+</Code>
+===== Evaluation Results =====
+^  Benchmark project  ^  Precision              ^^^  Recall                ^^^
+|                     |  FB    |  JT    |  Delta  |  FB    |  JT    |  Delta |
+|  Project ...        |  ...%  |  ...%  |  ...%   |  ...%  |  ...%  |  ...%  |
+|  Project ...        |  ...%  |  ...%  |  ...%   |  ...%  |  ...%  |  ...%  |
+FB = FindBugs, JT = JTransformer, Delta = JTransformer - FindBugs

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