| Replacing using regexes 
        Replacing with backreferencesInstead of m// , use
        s/// 
s/FSC/Follett Software Company/;
        would spell out FSC. 
s/(Chuck|Charles) (E\.
        )?Follett/Tom Schenck/i; changes a number of variations on
        Chuck's name to Tom's. The /i
        makes it case-insensitive in the match.  
        The replacement part of a regex can contain references to the search
        part. 
s/(\d\d)-(\d\d)-(\d\d\d\d)/$3$1$2/; changes
        dates in the form "mm-dd-yyyy" to "yyyymmdd" for sorting.
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