RegEx for matching brackets

[NevilleDNZ]

To check a complete python expression use:

def check_open_close(expr):
  try:
    eval(expr)
  except SyntaxError:
    return False
  else:
    return True

This also ignores brackets in quotes, and checks <= & >= operators are
syntatically correct etc...
But is may have side effects... ;-)
eg.
 check_open_close('__import__("os").system("echo rm -rf /") # OK')

c.f http://en.wikipedia.org/wiki/Scope_creep

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