If you don't care about escaped " chars: 

perl -pi -e 's/source "(.+?)"/source $1/g'

[download]

If you do: 

perl -pi -e 's/source "([^"\\]*(?:\\.[^"\\]*)*)"/source $1/g'

[download]

In reply to Re: remove a specific character occuring in file using script by eyepopslikeamosquito
in thread remove a specific character occuring in file using script by Anonymous Monk

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