Merged revisions 179973 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

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  r179973 | murf | 2009-03-03 15:12:02 -0700 (Tue, 03 Mar 2009) | 33 lines
  
  Merged revisions 179807 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.4
  
  I had some work to do to port these changes to trunk; the 
  check_expr stuff hasn't been updated here for quite some
  time, it appears. I added some more tests to the check_expr2
  suite. I had to play around with the makefile a bit, etc.
  
  I added STANDALONE2 #ifdefs to ast_expr2.y so as not to
  conflict structure with aelparse.
  
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    r179807 | murf | 2009-03-03 11:11:34 -0700 (Tue, 03 Mar 2009) | 19 lines
    
    These changes allow AEL to better check ${} constructs within $[...], that are concatenated with text.
    
    I modified and added rules in ast_expr2.fl to better handle
    the concatenations.
    
    I added some default routines to ast_expr2.y so the standalone would
    compile. It also looks like I haven't run this thru bison since 2.1, so
    it's good to get this updated.
    
    The Makefile has comments added now for check_expr2 and check_expr to
    explain what they are for, and how to run them. 
    
    The testexpr2s stuff has been removed, in favor of check_expr2.
    
    expr2.testinput has been updated to include the two expressions
    that inspired these changes (from mcnobody on #asterisk this morning)
    The regression has been run and all looks well.
  ........
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git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.6.1@180077 f38db490-d61c-443f-a65b-d21fe96a405b

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