title: Regular Expression for matching parentheses
body: <p>What is the regular expression for matching '(' in a string?</p>
  
  <p>Following is the scenario : </p>
  
  <p>I have a string </p>
  
  <pre><code>str = "abc(efg)";
  </code></pre>
  
  <p>I want to split the string at <code>'('</code> using regular expression.For that i am using </p>
  
  <pre><code>Arrays.asList(Pattern.compile("/(").split(str))
  </code></pre>
  
  <p>But i am getting the following exception.</p>
  
  <pre><code>java.util.regex.PatternSyntaxException: Unclosed group near index 2
  /(
  </code></pre>
  
  <p>Escaping <code>'('</code> doesn't seems to work.</p>