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    <p>Golfing =)</p> <pre><code>$ cat FILE Example, peter@yahoo.com peter@hotmail.co.in philip@gmail.com $ sed -r 's!@(.*)!_\1@generic.com!' FILE Example, peter_yahoo.com@generic.com peter_hotmail.co.in@generic.com philip_gmail.com@generic.com </code></pre> <p>In reply to user1428900, this is some explanations :</p> <pre><code>sed -r # sed in extended regex mode s # substitution ! # my delimiter, pick up anything you want instead !part of regex @(.*) # a literal "@" + capture of the rest of the line ! # middle delimiter _\1@generic.com # an "_" + the captured group N°1 + "@generic.com" ! # end delimiter FILE # file-name </code></pre> <p>Extended mode isn't really needed there, consider the same following snippet in <code>BRE</code> (basic regex) mode :</p> <pre><code> sed 's!@\(.*\)!_\1@generic.com!' FILE </code></pre> <p><strong>Edit</strong> to fit your new needs :</p> <pre><code>$ cat FILE Example, peter@yahoo.com,I am peter peter@hotmail.co.in philip@gmail.com $ sed -r 's!@(.*),.*!_\1@generic.com!' FILE Example, peter_yahoo.com@generic.com peter@hotmail.co.in philip@gmail.com </code></pre> <p>If you want only email lines, you can do something like that :</p> <pre><code>sed -r '/@/s!@(.*),.*!_\1@generic.com!' FILE </code></pre> <p>the <code>/@/</code> part means to only works on the lines containing the character <code>@</code></p> <p><strong>Edit2</strong>:</p> <p>if you want to keep the end lines like your new comments said :</p> <pre><code>sed -r 's!@(.*)(,.*)!_\1@generic.com\2!' FILE </code></pre>
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    1. COIt works! Thank you Can you please explain your command.
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    2. CODONE, see my explanations. I'm there if you need.
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    3. COwow thanks! so how do I approach this if I had text at the end of my domain names? Example, peter@yahoo.com,i am peter peter@hotmail.co.in,i am also peter I tried @(,) instead of @(.*) it doesn't work and I cant think of any other solution
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