replace value in file between two other values

I have a huge file and who like to replace all instances of

host=something;

The value of host could also be

hostname="something";

I gather I need to find each occurrence of the word host and replace whether value is there from the equal sign to the semi-colon. I will replace the value of host to be “testhost”
MatthewFAsked:
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rj2Connect With a Mentor Commented:
$text=~s/host(?:name)?=[^;]+;/host=testhost;/g;
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TintinCommented:
And to rj2's regex from the command line, do:

 perl -i.bak -pe 's/host(?:name)?=[^;]+;/host=testhost;/g' hugefile

the -i.bak will create a backup of the file before doing the subsitution.
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