to replace one character by numbers in a file

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uri::heuristic

URI::Heuristic(3)					User Contributed Perl Documentation					 URI::Heuristic(3)

NAME

       uf_uristr - Expand URI using heuristics

SYNOPSIS

	use URI::Heuristic qw(uf_uristr);
	$u = uf_uristr("perl"); 	    # http://www.perl.com
	$u = uf_uristr("www.sol.no/sol");   # http://www.sol.no/sol
	$u = uf_uristr("aas");		    # http://www.aas.no
	$u = uf_uristr("ftp.funet.fi");     # ftp://ftp.funet.fi
	$u = uf_uristr("/etc/passwd");	    # file:/etc/passwd

DESCRIPTION

       This module provides functions that expand strings into real absolute URIs using some builtin heuristics.  Strings that already represent
       absolute URIs (i.e. start with a "scheme:" part) are never modified and are returned unchanged.	The main use of these functions are to
       allow abbreviated URIs similar to what many web browsers allow for URIs typed in by the user.

       The following functions are provided:

       uf_uristr($str)
	   The uf_uristr() function will try to make the string passed as argument into a proper absolute URI string.  The "uf_" prefix stands for
	   "User Friendly".  Under MacOS, it assumes that any string with a common URL scheme (http, ftp, etc.) is a URL rather than a local path.
	   So don't name your volumes after common URL schemes and expect uf_uristr() to construct valid file: URL's on those volumes for you,
	   because it won't.

       uf_uri($str)
	   This functions work the same way as uf_uristr() but it will return a "URI" object.

ENVIRONMENT

       If the hostname portion of a URI does not contain any dots, then certain qualified guesses will be made.  These guesses are governed be the
       following two environment variables.

       COUNTRY	 This is the two letter country code (ISO 3166) for your location.  If the domain name of your host ends with two letters, then it
		 is taken to be the default country. See also Locale::Country.

       URL_GUESS_PATTERN
		 Contain a space separated list of URL patterns to try.  The string "ACME" is for some reason used as a placeholder for the host
		 name in the URL provided.  Example:

		  URL_GUESS_PATTERN="www.ACME.no www.ACME.se www.ACME.com"
		  export URL_GUESS_PATTERN

		 Specifying URL_GUESS_PATTERN disables any guessing rules based on country.  An empty URL_GUESS_PATTERN disables any guessing that
		 involves host name lookups.

COPYRIGHT

       Copyright 1997-1998, Gisle Aas

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.8.0							    2002-01-16							 URI::Heuristic(3)

Shell Programming and Scripting