Parsing text

How can I parse a bunch of words from a text file?

For example I have a file that contains a list of words Ex-
and I want to take this file annd remove these words from another text file that conatins the data Ex.
There is a lot of text with the following parsing data that needs to be parsed and only the keywords should remain.

I know I can use the regular expressions to search for a words and replace it with someting else or nothing.  But how do I do it for a list of words?

Any suggestions appreciated?
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perldoc -q "How do I efficiently match many regular expressions at once"
open KW, 'keywordfile';
@kw = map {chop; $_} <KW>;
close KW;

#form RE
$re = join '\b)|(\b', '(\b', @kw, '\b)';

open TXT, 'arg_file';
while (<TXT>){
  print $_;

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#I might prefer
$re = '\b('.(join'|',@kw).')\b';
sdesarAuthor Commented:
Thanks !!
How can I use those keywords and extract only parah. that consists of a particular keyword.
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