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+.\" ========================================================================
+.\"
+.IX Title "Approx 3pm"
+.TH Approx 3pm "2013-01-22" "perl v5.14.2" "User Contributed Perl Documentation"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+String::Approx \- Perl extension for approximate matching (fuzzy matching)
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\&  use String::Approx \*(Aqamatch\*(Aq;
+\&
+\&  print if amatch("foobar");
+\&
+\&  my @matches = amatch("xyzzy", @inputs);
+\&
+\&  my @catches = amatch("plugh", [\*(Aq2\*(Aq], @inputs);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+String::Approx lets you match and substitute strings approximately.
+With this you can emulate errors: typing errorrs, speling errors,
+closely related vocabularies (colour color), genetic mutations (\s-1GAG\s0
+\&\s-1ACT\s0), abbreviations (McScot, MacScot).
+.PP
+\&\s-1NOTE:\s0 String::Approx suits the task of \fBstring matching\fR, not 
+\&\fBstring comparison\fR, and it works for \fBstrings\fR, not for \fBtext\fR.
+.PP
+If you want to compare strings for similarity, you probably just want
+the Levenshtein edit distance (explained below), the Text::Levenshtein
+and Text::LevenshteinXS modules in \s-1CPAN\s0.  See also Text::WagnerFischer
+and Text::PhraseDistance.  (There are functions for this in String::Approx,
+e.g. \fIadist()\fR, but their results sometimes differ from the bare Levenshtein
+et al.)
+.PP
+If you want to compare things like text or source code, consisting of
+\&\fBwords\fR or \fBtokens\fR and \fBphrases\fR and \fBsentences\fR, or
+\&\fBexpressions\fR and \fBstatements\fR, you should probably use some other
+tool than String::Approx, like for example the standard \s-1UNIX\s0 \fIdiff\fR\|(1)
+tool, or the Algorithm::Diff module from \s-1CPAN\s0.
+.PP
+The measure of \fBapproximateness\fR is the \fILevenshtein edit distance\fR.
+It is the total number of \*(L"edits\*(R": insertions,
+.PP
+.Vb 1
+\&        word world
+.Ve
+.PP
+deletions,
+.PP
+.Vb 1
+\&        monkey money
+.Ve
+.PP
+and substitutions
+.PP
+.Vb 1
+\&        sun fun
+.Ve
+.PP
+required to transform a string to another string.  For example, to
+transform \fI\*(L"lead\*(R"\fR into \fI\*(L"gold\*(R"\fR, you need three edits:
+.PP
+.Vb 1
+\&        lead gead goad gold
+.Ve
+.PP
+The edit distance of \*(L"lead\*(R" and \*(L"gold\*(R" is therefore three, or 75%.
+.PP
+\&\fBString::Approx\fR uses the Levenshtein edit distance as its measure, but
+String::Approx is not well-suited for comparing strings of different
+length, in other words, if you want a \*(L"fuzzy eq\*(R", see above.
+String::Approx is more like regular expressions or \fIindex()\fR, it finds
+substrings that are close matches.>
+.SH "MATCH"
+.IX Header "MATCH"
+.Vb 1
+\&        use String::Approx \*(Aqamatch\*(Aq;
+\&
+\&        $matched     = amatch("pattern") 
+\&        $matched     = amatch("pattern", [ modifiers ])
+\&
+\&        $any_matched = amatch("pattern", @inputs) 
+\&        $any_matched = amatch("pattern", [ modifiers ], @inputs)
+\&
+\&        @match       = amatch("pattern") 
+\&        @match       = amatch("pattern", [ modifiers ])
+\&
+\&        @matches     = amatch("pattern", @inputs) 
+\&        @matches     = amatch("pattern", [ modifiers ], @inputs)
+.Ve
+.PP
+Match \fBpattern\fR approximately.  In list context return the matched
+\&\fB\f(CB@inputs\fB\fR.  If no inputs are given, match against the \fB\f(CB$_\fB\fR.  In scalar
+context return true if \fIany\fR of the inputs match, false if none match.
+.PP
+Notice that the pattern is a string.  Not a regular expression.  None
+of the regular expression notations (^, ., *, and so on) work.  They
+are characters just like the others.  Note-on-note: some limited form
+of \fI\*(L"regular expressionism\*(R"\fR is planned in future: for example
+character classes ([abc]) and \fIany-chars\fR (.).  But that feature will
+be turned on by a special \fImodifier\fR (just a guess: \*(L"r\*(R"), so there
+should be no backward compatibility problem.
+.PP
+Notice also that matching is not symmetric.  The inputs are matched
+against the pattern, not the other way round.  In other words: the
+pattern can be a substring, a submatch, of an input element.  An input
+element is always a superstring of the pattern.
+.SS "\s-1MODIFIERS\s0"
+.IX Subsection "MODIFIERS"
+With the modifiers you can control the amount of approximateness and
+certain other control variables.  The modifiers are one or more
+strings, for example \fB\*(L"i\*(R"\fR, within a string optionally separated by
+whitespace.  The modifiers are inside an anonymous array: the \fB[ ]\fR
+in the syntax are not notational, they really do mean \fB[ ]\fR, for
+example \fB[ \*(L"i\*(R", \*(L"2\*(R" ]\fR.  \fB[\*(L"2 i\*(R"]\fR would be identical.
+.PP
+The implicit default approximateness is 10%, rounded up.  In other
+words: every tenth character in the pattern may be an error, an edit.
+You can explicitly set the maximum approximateness by supplying a
+modifier like
+.PP
+.Vb 2
+\&        number
+\&        number%
+.Ve
+.PP
+Examples: \fB\*(L"3\*(R"\fR, \fB\*(L"15%\*(R"\fR.
+.PP
+Note that \f(CW\*(C`0%\*(C'\fR is not rounded up, it is equal to \f(CW0\fR.
+.PP
+Using a similar syntax you can separately control the maximum number
+of insertions, deletions, and substitutions by prefixing the numbers
+with I, D, or S, like this:
+.PP
+.Vb 6
+\&        Inumber
+\&        Inumber%
+\&        Dnumber
+\&        Dnumber%
+\&        Snumber
+\&        Snumber%
+.Ve
+.PP
+Examples: \fB\*(L"I2\*(R"\fR, \fB\*(L"D20%\*(R"\fR, \fB\*(L"S0\*(R"\fR.
+.PP
+You can ignore case (\fB\*(L"A\*(R"\fR becames equal to \fB\*(L"a\*(R"\fR and vice versa)
+by adding the \fB\*(L"i\*(R"\fR modifier.
+.PP
+For example
+.PP
+.Vb 1
+\&        [ "i 25%", "S0" ]
+.Ve
+.PP
+means \fIignore case\fR, \fIallow every fourth character to be \*(L"an edit\*(R"\fR,
+but allow \fIno substitutions\fR.  (See \s-1NOTES\s0 about disallowing
+substitutions or insertions.)
+.PP
+\&\s-1NOTE:\s0 setting \f(CW\*(C`I0 D0 S0\*(C'\fR is not equivalent to using \fIindex()\fR.
+If you want to use \fIindex()\fR, use \fIindex()\fR.
+.SH "SUBSTITUTE"
+.IX Header "SUBSTITUTE"
+.Vb 1
+\&        use String::Approx \*(Aqasubstitute\*(Aq;
+\&
+\&        @substituted = asubstitute("pattern", "replacement")
+\&        @substituted = asubstitute("pattern", "replacement", @inputs) 
+\&        @substituted = asubstitute("pattern", "replacement", [ modifiers ])
+\&        @substituted = asubstitute("pattern", "replacement",
+\&                                   [ modifiers ], @inputs)
+.Ve
+.PP
+Substitute approximate \fBpattern\fR with \fBreplacement\fR and return as a
+list <copies> of \fB\f(CB@inputs\fB\fR, the substitutions having been made on the
+elements that did match the pattern.  If no inputs are given,
+substitute in the \fB\f(CB$_\fB\fR.  The replacement can contain magic strings
+\&\fB$&\fR, \fB$`\fR, \fB$'\fR that stand for the matched string, the string
+before it, and the string after it, respectively.  All the other
+arguments are as in \f(CW\*(C`amatch()\*(C'\fR, plus one additional modifier, \fB\*(L"g\*(R"\fR
+which means substitute globally (all the matches in an element and not
+just the first one, as is the default).
+.PP
+See \*(L"\s-1BAD\s0 \s-1NEWS\s0\*(R" about the unfortunate stinginess of \f(CW\*(C`asubstitute()\*(C'\fR.
+.SH "INDEX"
+.IX Header "INDEX"
+.Vb 1
+\&        use String::Approx \*(Aqaindex\*(Aq;
+\&
+\&        $index   = aindex("pattern")
+\&        @indices = aindex("pattern", @inputs)
+\&        $index   = aindex("pattern", [ modifiers ])
+\&        @indices = aindex("pattern", [ modifiers ], @inputs)
+.Ve
+.PP
+Like \f(CW\*(C`amatch()\*(C'\fR but returns the index/indices at which the pattern
+matches approximately.  In list context and if \f(CW@inputs\fR are used,
+returns a list of indices, one index for each input element.
+If there's no approximate match, \f(CW\*(C`\-1\*(C'\fR is returned as the index.
+.PP
+\&\s-1NOTE:\s0 if there is character repetition (e.g. \*(L"aa\*(R") either in
+the pattern or in the text, the returned index might start 
+\&\*(L"too early\*(R".  This is consistent with the goal of the module
+of matching \*(L"as early as possible\*(R", just like regular expressions
+(that there might be a \*(L"less approximate\*(R" match starting later is
+of somewhat irrelevant).
+.PP
+There's also backwards-scanning \f(CW\*(C`arindex()\*(C'\fR.
+.SH "SLICE"
+.IX Header "SLICE"
+.Vb 1
+\&        use String::Approx \*(Aqaslice\*(Aq;
+\&
+\&        ($index, $size)   = aslice("pattern")
+\&        ([$i0, $s0], ...) = aslice("pattern", @inputs)
+\&        ($index, $size)   = aslice("pattern", [ modifiers ])
+\&        ([$i0, $s0], ...) = aslice("pattern", [ modifiers ], @inputs)
+.Ve
+.PP
+Like \f(CW\*(C`aindex()\*(C'\fR but returns also the size (length) of the match.
+If the match fails, returns an empty list (when matching against \f(CW$_\fR)
+or an empty anonymous list corresponding to the particular input.
+.PP
+\&\s-1NOTE:\s0 size of the match will very probably be something you did not
+expect (such as longer than the pattern, or a negative number).  This
+may or may not be fixed in future releases. Also the beginning of the
+match may vary from the expected as with \fIaindex()\fR, see above.
+.PP
+If the modifier
+.PP
+.Vb 1
+\&        "minimal_distance"
+.Ve
+.PP
+is used, the minimal possible edit distance is returned as the
+third element:
+.PP
+.Vb 2
+\&        ($index, $size, $distance) = aslice("pattern", [ modifiers ])
+\&        ([$i0, $s0, $d0], ...)     = aslice("pattern", [ modifiers ], @inputs)
+.Ve
+.SH "DISTANCE"
+.IX Header "DISTANCE"
+.Vb 1
+\&        use String::Approx \*(Aqadist\*(Aq;
+\&
+\&        $dist = adist("pattern", $input);
+\&        @dist = adist("pattern", @input);
+.Ve
+.PP
+Return the \fIedit distance\fR or distances between the pattern and the
+input or inputs.  Zero edit distance means exact match.  (Remember
+that the match can 'float' in the inputs, the match is a substring
+match.)  If the pattern is longer than the input or inputs, the
+returned distance or distances is or are negative.
+.PP
+.Vb 1
+\&        use String::Approx \*(Aqadistr\*(Aq;
+\&
+\&        $dist = adistr("pattern", $input);
+\&        @dist = adistr("pattern", @inputs);
+.Ve
+.PP
+Return the \fBrelative\fR \fIedit distance\fR or distances between the
+pattern and the input or inputs.  Zero relative edit distance means
+exact match, one means completely different.  (Remember that the
+match can 'float' in the inputs, the match is a substring match.)  If
+the pattern is longer than the input or inputs, the returned distance
+or distances is or are negative.
+.PP
+You can use \fIadist()\fR or \fIadistr()\fR to sort the inputs according to their
+approximateness:
+.PP
+.Vb 3
+\&        my %d;
+\&        @d{@inputs} = map { abs } adistr("pattern", @inputs);
+\&        my @d = sort { $d{$a} <=> $d{$b} } @inputs;
+.Ve
+.PP
+Now \f(CW@d\fR contains the inputs, the most like \f(CW"pattern"\fR first.
+.SH "CONTROLLING THE CACHE"
+.IX Header "CONTROLLING THE CACHE"
+\&\f(CW\*(C`String::Approx\*(C'\fR maintains a \s-1LU\s0 (least-used) cache that holds the
+\&'matching engines' for each instance of a \fIpattern+modifiers\fR.  The
+cache is intended to help the case where you match a small set of
+patterns against a large set of string.  However, the more engines you
+cache the more you eat memory.  If you have a lot of different
+patterns or if you have a lot of memory to burn, you may want to
+control the cache yourself.  For example, allowing a larger cache
+consumes more memory but probably runs a little bit faster since the
+cache fills (and needs flushing) less often.
+.PP
+The cache has two parameters: \fImax\fR and \fIpurge\fR.  The first one
+is the maximum size of the cache and the second one is the cache
+flushing ratio: when the number of cache entries exceeds \fImax\fR,
+\&\fImax\fR times \fIpurge\fR cache entries are flushed.  The default
+values are 1000 and 0.75, respectively, which means that when
+the 1001st entry would be cached, 750 least used entries will
+be removed from the cache.  To access the parameters you can
+use the calls
+.PP
+.Vb 2
+\&        $now_max = String::Approx::cache_max();
+\&        String::Approx::cache_max($new_max);
+\&
+\&        $now_purge = String::Approx::cache_purge();
+\&        String::Approx::cache_purge($new_purge);
+\&
+\&        $limit = String::Approx::cache_n_purge();
+.Ve
+.PP
+To be honest, there are actually \fBtwo\fR caches: the first one is used
+far the patterns with no modifiers, the second one for the patterns
+with pattern modifiers.  Using the standard parameters you will
+therefore actually cache up to 2000 entries.  The above calls control
+both caches for the same price.
+.PP
+To disable caching completely use
+.PP
+.Vb 1
+\&        String::Approx::cache_disable();
+.Ve
+.PP
+Note that this doesn't flush any possibly existing cache entries,
+to do that use
+.PP
+.Vb 1
+\&        String::Approx::cache_flush_all();
+.Ve
+.SH "NOTES"
+.IX Header "NOTES"
+Because matching is by \fIsubstrings\fR, not by whole strings, insertions
+and substitutions produce often very similar results: \*(L"abcde\*(R" matches
+\&\*(L"axbcde\*(R" either by insertion \fBor\fR substitution of \*(L"x\*(R".
+.PP
+The maximum edit distance is also the maximum number of edits.
+That is, the \fB\*(L"I2\*(R"\fR in
+.PP
+.Vb 1
+\&        amatch("abcd", ["I2"])
+.Ve
+.PP
+is useless because the maximum edit distance is (implicitly) 1.
+You may have meant to say
+.PP
+.Vb 1
+\&        amatch("abcd", ["2D1S1"])
+.Ve
+.PP
+or something like that.
+.PP
+If you want to simulate transposes
+.PP
+.Vb 1
+\&        feet fete
+.Ve
+.PP
+you need to allow at least edit distance of two because in terms of
+our edit primitives a transpose is first one deletion and then one
+insertion.
+.SS "\s-1TEXT\s0 \s-1POSITION\s0"
+.IX Subsection "TEXT POSITION"
+The starting and ending positions of matching, substituting, indexing, or
+slicing can be changed from the beginning and end of the input(s) to
+some other positions by using either or both of the modifiers
+.PP
+.Vb 2
+\&        "initial_position=24"
+\&        "final_position=42"
+.Ve
+.PP
+or the both the modifiers
+.PP
+.Vb 2
+\&        "initial_position=24"
+\&        "position_range=10"
+.Ve
+.PP
+By setting the \fB\*(L"position_range\*(R"\fR to be zero you can limit
+(anchor) the operation to happen only once (if a match is possible)
+at the position.
+.SH "VERSION"
+.IX Header "VERSION"
+Major release 3.
+.SH "CHANGES FROM VERSION 2"
+.IX Header "CHANGES FROM VERSION 2"
+.SS "\s-1GOOD\s0 \s-1NEWS\s0"
+.IX Subsection "GOOD NEWS"
+.IP "The version 3 is 2\-3 times faster than version 2" 4
+.IX Item "The version 3 is 2-3 times faster than version 2"
+.PD 0
+.IP "No pattern length limitation" 4
+.IX Item "No pattern length limitation"
+.PD
+The algorithm is independent on the pattern length: its time
+complexity is \fIO(kn)\fR, where \fIk\fR is the number of edits and \fIn\fR the
+length of the text (input).  The preprocessing of the pattern will of
+course take some \fIO(m)\fR (\fIm\fR being the pattern length) time, but
+\&\f(CW\*(C`amatch()\*(C'\fR and \f(CW\*(C`asubstitute()\*(C'\fR cache the result of this
+preprocessing so that it is done only once per pattern.
+.SS "\s-1BAD\s0 \s-1NEWS\s0"
+.IX Subsection "BAD NEWS"
+.IP "You do need a C compiler to install the module" 4
+.IX Item "You do need a C compiler to install the module"
+Perl's regular expressions are no more used; instead a faster and more
+scalable algorithm written in C is used.
+.ie n .IP """asubstitute()"" is now always stingy" 4
+.el .IP "\f(CWasubstitute()\fR is now always stingy" 4
+.IX Item "asubstitute() is now always stingy"
+The string matched and substituted is now always stingy, as short
+as possible.  It used to be as long as possible.  This is an unfortunate
+change stemming from switching the matching algorithm.  Example: with
+edit distance of two and substituting for \fB\*(L"word\*(R"\fR from \fB\*(L"cork\*(R"\fR and
+\&\fB\*(L"wool\*(R"\fR previously did match \fB\*(L"cork\*(R"\fR and \fB\*(L"wool\*(R"\fR.  Now it does
+match \fB\*(L"or\*(R"\fR and \fB\*(L"wo\*(R"\fR.  As little as possible, or, in other words,
+with as much approximateness, as many edits, as possible.  Because
+there is no \fIneed\fR to match the \fB\*(L"c\*(R"\fR of \fB\*(L"cork\*(R"\fR, it is not matched.
+.ie n .IP "no more ""aregex()"" because regular expressions are no more used" 4
+.el .IP "no more \f(CWaregex()\fR because regular expressions are no more used" 4
+.IX Item "no more aregex() because regular expressions are no more used"
+.PD 0
+.ie n .IP "no more ""compat1"" for String::Approx version 1 compatibility" 4
+.el .IP "no more \f(CWcompat1\fR for String::Approx version 1 compatibility" 4
+.IX Item "no more compat1 for String::Approx version 1 compatibility"
+.PD
+.SH "ACKNOWLEDGEMENTS"
+.IX Header "ACKNOWLEDGEMENTS"
+The following people have provided valuable test cases, documentation
+clarifications, and other feedback:
+.PP
+Jared August, Arthur Bergman, Anirvan Chatterjee, Steve A. Chervitz,
+Aldo Calpini, David Curiel, Teun van den Dool, Alberto Fontaneda,
+Rob Fugina, Dmitrij Frishman, Lars Gregersen, Kevin Greiner,
+B. Elijah Griffin, Mike Hanafey, Mitch Helle, Ricky Houghton,
+\&'idallen', Helmut Jarausch, Damian Keefe, Ben Kennedy, Craig Kelley,
+Franz Kirsch, Dag Kristian, Mark Land, J. D. Laub, John P. Linderman,
+Tim Maher, Juha Muilu, Sergey Novoselov, Andy Oram, Ji Y Park,
+Eric Promislow, Nikolaus Rath, Stefan Ram, Slaven Rezic,
+Dag Kristian Rognlien, Stewart Russell, Slaven Rezic, Chris Rosin,
+Pasha Sadri, Ilya Sandler, Bob J.A. Schijvenaars, Ross Smith,
+Frank Tobin, Greg Ward, Rich Williams, Rick Wise.
+.PP
+The matching algorithm was developed by Udi Manber, Sun Wu, and Burra
+Gopal in the Department of Computer Science, University of Arizona.
+.SH "AUTHOR"
+.IX Header "AUTHOR"
+Jarkko Hietaniemi <jhi@iki.fi>
+.SH "COPYRIGHT AND LICENSE"
+.IX Header "COPYRIGHT AND LICENSE"
+Copyright 2001\-2013 by Jarkko Hietaniemi
+.PP
+This library is free software; you can redistribute it and/or modify
+under either the terms of the Artistic License 2.0, or the \s-1GNU\s0 Library
+General Public License, Version 2.  See the files Artistic and \s-1LGPL\s0
+for more details.
+.PP
+Furthermore: no warranties or obligations of any kind are given, and
+the separate file \fI\s-1COPYRIGHT\s0\fR must be included intact in all copies
+and derived materials.