title: How to search for string with one variable position in the string?
body: <p>I would like to find in a large file all lines, which contain a string and allow ONE character in my string to be different and still consider it a match.</p>
  <p>For example I have this file:</p>
  <pre><code>&gt;1 agctcaTATAAGtataagctagaagta
  &gt;2 gatgctagcgaagtaatgc
  &gt;3 atatagcgctagagccgtagta
  &gt;4 gctagcaTATCAGgatgtagtagta
  ...
  </code></pre>
  <p>and this string: <code>tataag</code>, so I get this output:</p>
  <pre><code>&gt;1 agctcaTATAAGtataagctagaagta
  &gt;4 gctagcaTATCAGgatgtagtagta
  </code></pre>
  <p>Because line 1 matches directly and line 4 is a match for all but the letter <code>A</code> where it has a <code>C</code> instead.</p>