Jim Meyering 8406b91aba (docolon): Test (re_buffer.re_nsub > 0) rather than
searching for `\(' to determine whether to return 0 or the empty
string.  Before it would improperly return '' if the pattern
contained a substring like this: `\\('.  From Karl Heuer.
For example, running expr c : '\\(' should print `0'.
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