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i have a file say file.txt having following contents

<tags>match the string</tags>
<tags>match</tags>

later the file should be(preferably with the same file name"file.txt")

<tags>match the...

I am new to linux and would like to modify the contents of a file preferably using a one line. The situation is as follows

<start>
some lines
"I am the string"
"replace string"
more lines...