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copied!<p>This appears to be caused by the use of ranges within regular expression searches.</p> <p>It doesn't occur for the first character in the range. It doesn't occur at all for non-ranges.</p> <pre><code>> echo a | findstr /r "[A-C]" > echo b | findstr /r "[A-C]" b > echo c | findstr /r "[A-C]" c > echo d | findstr /r "[A-C]" > echo b | findstr /r "[B-C]" > echo c | findstr /r "[B-C]" c > echo a | findstr /r "[ABC]" > echo b | findstr /r "[ABC]" > echo c | findstr /r "[ABC]" > echo d | findstr /r "[ABC]" > echo b | findstr /r "[BC]" > echo c | findstr /r "[BC]" > echo A | findstr /r "[A-C]" A > echo B | findstr /r "[A-C]" B > echo C | findstr /r "[A-C]" C > echo D | findstr /r "[A-C]" </code></pre> <p>According to the <a href="http://ss64.com/nt/findstr.html" rel="nofollow noreferrer"><code>SS64 CMD FINDSTR</code> page</a> (which, in a stunning display of circularity, references this question), the range <code>[A-Z]</code>:</p> <blockquote> <p>... includes the complete English alphabet, both upper and lower case (except for "a"), as well as non-English alpha characters with diacriticals.</p> </blockquote> <p>To get around the problem in my environment, I simply used specific regular expressions (such as <code>[ABCD]</code> rather than <code>[A-D]</code>). A more sensible approach for those that are allowed would be to download <a href="http://www.cygwin.com/" rel="nofollow noreferrer">CygWin</a> or <a href="http://gnuwin32.sourceforge.net/packages.html" rel="nofollow noreferrer">GnuWin32</a> and use <code>grep</code> from one of those packages.</p>

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