agrep, version 2.04

This is version 2.04 of agrep - a new tool for fast text searching allowing 
errors.  agrep is similar to egrep (or grep or fgrep), but it is much more 
general (and usually faster).

The main changes from version 1.1 are 1) incorporating Boyer-Moore
type filtering to speed up search considerably, 2) allowing multiple
patterns via the -f option; this is similar to fgrep, but from our 
experience agrep is much faster, 3) searching for "best match" without 
having to specify the number of errors allowed, and 4) ascii is no 
longer required.  Several more options were added.

To compile, simply run make in the agrep directory after untar'ing
the tar file (tar -xf agrep-2.04.tar will do it).

The three most significant features of agrep that are not supported by
the grep family are 
1) the ability to search for approximate patterns;
    for example, "agrep -2 homogenos foo" will find homogeneous as well 
    as any other word that can be obtained from homogenos with at most 
    2 substitutions, insertions, or deletions.
        agrep -B homogenos foo
    will generate a message of the form:
        best match has 2 errors, there are 5 matches, output them? (y/n)
2) agrep is record oriented rather than just line oriented;  a record
    is by default a line, but it can be user defined;
    for example, "agrep -d '^From ' 'pizza' mbox"
    outputs all mail messages that contain the keyword "pizza".
    Another example:  "agrep -d '$$' pattern foo" will output all
    paragraphs (separated by an empty line) that contain pattern.
3) multiple patterns with AND (or OR) logic queries.   
    For example, "agrep -d '^From ' 'burger,pizza' mbox" 
    outputs all mail messages containing at least one of the 
    two keywords (, stands for OR).
    "agrep -d '^From ' 'good;pizza' mbox" outputs all mail messages
    containing both keywords.