regexp: different match, re=1 vs re=0

Version: 7.4, gVim, MS-DOS/MS-Windows
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:%s#\[\(com\|ref\|ex\|p\|i\|u\|s\|b\)\]\zs\s\+\|\s\+\ze\[/\(com\|ref\|ex\|p\|i\|u\|s\|b\)\]\|[({]\zs\s\+\|\s\+\ze[)}]\|\s\zs\s\+\|\s\+\ze[,;.]\([^.,;]\)##g
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the command line as above, one line for test as follows, <Space> means a space.
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This<Space>is<Space><Space><Space>[a<Space>test.
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Result of re=1: This<Space>is<Space>[a<Space>test.
Result of re=0: This<Space>is<Space><Space>test.
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Both of these regexp engines have the same result if the following command line is used:-)
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:%s#\[\(com\|ref\|ex\|p\|i\|u\|s\|b\)\]\zs\s\+\ze\|\zs\s\+\ze\[/\(com\|ref\|ex\|p\|i\|u\|s\|b\)\]\|[({]\zs\s\+\ze\|\zs\s\+\ze[)}]\|\s\zs\s\+\ze\|\zs\s\+\ze[,;.]\([^.,;]\)##g
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Thanks
-William

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