title: Extracting unique syscall names from strace output (via regex?)
body: <p>I have a file produced by <a href="http://linux.die.net/man/1/strace" rel="nofollow">strace</a> which contains all the system calls. Now I want to get the name of all system calls. Therefore, say if I have <code>mprotect</code> listed 4 times, I only need to list it 1 time, that is I only need to list unique system calls. </p>
  
  <p>One method that comes to mind is to use regular expressions using python or any other language that supports parsing regular expression to first see all system calls and then eliminate the duplicates. For that purpose, I was first trying to test my regular expression using the search feature of notepad++. I want to match anything like this, <code>blah(</code>. For that purpose I devised the following regular expression </p>
  
  <p><code>[a-zA-Z_](</code> </p>
  
  <p>but notepad found nothing. What do you think is the correct regular expression for this? </p>