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How to replace with patter match using Perl

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http://www.unix.com – I have to replace a line, if it has a pattern for example Suppose file.out contains: Code: <tr><td class="cB">Hello</td><td class="cB">1245</td><td class="cB">958</td><td class="cRB">1.34</td><td class="cRB">1.36</td></tr> <tr><td class="cB">world</td><td class="cB">3256</td><td class="cB">364</td><td class="cB">1.23</td><td class="cB">2.58</td></tr& (HowTos)