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# /usr/bin/perl

...
ab c,ab c\,ab c/abc,ab cd,ab cd\,ab cd\x,ab c/abc
ab cd\ab c,a+b,a+b/,a+b\abc,bar,bar\zot,\,/,\abc,/abc,\x,/x
/\,\/,/\x,\/x

     'abc' begins 'abc'
     'abc' begins 'abc\'
...
     'a+b' begins 'a+b'
     'a+b' begins 'a+b/'
     'a+b' begins 'a+b\abc'