updated for version 7.4.107 Problem: Python: When vim.eval() encounters a Vim error, a try/catch in the Python code doesn't catch it. (Yggdroot Chen) Solution: Throw exceptions on errors in vim.eval(). (ZyX)

start:
test for empty string: ok
test for 1 char: ok
test for 3 chars: ok
test for contains meta char: ok
test for contains non-ascii char: ok