title: Need to convert the below awk command into sed
body: <p>I need to convert the below awk command into sed, <br>
  <code>awk -F ',' '$2 ~ /^ *[0-9]*(\.[0-9]+)?" *$/{sub(/"/, "", $2); print $2}'</code></p>
  
  <p>Below is my input file:</p>
  
  <p>sample.txt:</p>
  
  <p><code>3",3"</code><br>
  <code>6-position,6-position</code><br>
  <code>7' 4" to 10' 3-1/2",7' 4" to 10' 3-1/2"</code><br>
  <code>4.8",4.8"</code><br>
  <code>Adjustable from 99" to 111" - max 148,Adjustable from 99" to 111" - max 148</code><br></p>
  
  <p>And i need the output as below,<br></p>
  
  <p>output.txt:<br></p>
  
  <p><code>3",3</code><br>
  <code>6-position,</code><br>
  <code>7' 4" to 10' 3-1/2",</code><br>
  <code>4.8",4.8</code><br>
  <code>Adjustable from 99" to 111" - max 148,</code><br>
  So basically I need to print the numeric value for the " symbol, other non-numeric text needs to be replaced by a empty line, the problem with awk command is the 2,3 and 5 line is getting removed. </p>