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124 lines
1.8 KiB
Perl
124 lines
1.8 KiB
Perl
#A word-count program that handles multiple spaces and tabs between words.!
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#!/usr/local/bin/perl
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$wordcount = 0;
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$line = <STDIN>;
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while ($line ne "") {
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chop ($line);
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@words = split(/[\t ]+/, $line);
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$wordcount += @words;
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$line = <STDIN>;
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}
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print ("Total number of words: $wordcount\n");
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#Escape Sequences for Special Characters!
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To include a backslash in a pattern, specify two backslashes:
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/\\+/
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This pattern tests for one or more occurrences of \ in a string.
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#Escape sequences, \n and \t!
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while(<DATA>){
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print if s/\n/\t/;
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}
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__DATA__
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AA AA AQA 101
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# Match the new line character!
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$_ = "This text\nhas multiple lines.";
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s/^/BOL/g;
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s/$/EOL/g;
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print;
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#Skip blank lines and comments!
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#!/usr/bin/perl
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use warnings;
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use strict;
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while (<>) {
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chomp; # strip trailing linefeed from $_
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next if /^(\s*(#.*)?)?$/; # skip blank lines and comments
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print "Got: $_ \n";
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}
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#Match multiline patterns?!
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#!/usr/local/bin/perl -w
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use strict;
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$/ = ""; # Paragraph mode
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while(<>) {
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print $1 if /(lines.*\n.*spaces)/s;
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}
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#Multiplies every integer in a file by 2!
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#!/usr/local/bin/perl
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$count = 0;
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while ($ARGV[$count] ne "") {
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open (FILE, "$ARGV[$count]");
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@file = <FILE>;
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$linenum = 0;
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while ($file[$linenum] ne "") {
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$file[$linenum] =~ s/\d+/$& * 2/eg;
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$linenum++;
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}
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close (FILE);
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open (FILE, ">$ARGV[$count]");
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print FILE (@file);
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close (FILE);
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$count++;
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}
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