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& (ampersand)
and HTML 178
and subroutines 119, 121
default data 58
inputting data 57
&& (double ampersand), logical and
operator 105
* (asterisk)
multiplication operator 75
quantifier in search patterns 154
** (double asterisk), exponential powers 77
@ (at sign)
@_ (underscore array), and
subroutines 120
and hashes 129
array variables 25
arrays 8399
escaping in e-mail addresses 209
[ ] (brackets)
and character classes 146, 147
for individual elements of array 84
^ (caret)
limiting location of search patterns 149
negating character classes 147
{ } (curly brackets)
and hashes 128, 129
closing 115
in search patterns 155
/ (division) 75
See also forward slashes
$ (dollar sign)
$&, and found data 140
$n, in search patterns 158
$`, and found data 140
$, and found data 140
as Unix prompt 242
for individual elements
of arrays 84
of hashes 128
limiting location of search patterns 149
scalar variables 25
= (equals sign)
combined with other operators 81
inputting arrays 70
inputting hashes 71
inputting scalar data 69
storing result of operation 74
== (double equals signs), equal to
comparison operator 102
=~ (binding operator) 139
and finding 138
!= (not equal to), comparison operator 102
> (greater than)
and writing to files 190
as Unix prompt 242
comparison operator 102
>= (greater than or equal to), comparison
operator 102
>> (double greater than), and appending
files 190
< (less than)
and reading files 190
comparison operator 102
<= (less than or equal to), comparison
operator 102
- (minus/hyphen)
and search patterns 146
subtraction operator 75
-- (double minus), decrement operator 82
and for block 113
% (percent sign)
as Unix prompt 242
hash variables 25
modulus operator 78
. (period)
concatenation 79
wildcard in search patterns 144
+ (plus)
addition operator 75
quantifier in search patterns 153
++ (double plus), increment operator 82
and for block 113
and while conditionals 110
# (pound symbol)
and debugging 215
and matching 138
for comments 35
? (question mark)
and non-greedy quantifiers 156
default data 58
inputting data 57
quantifier in search patterns 152
~ (tilde), on Unix servers 243
See also =~
| (vertical bar)
alternation, in search patterns 157
piping, and e-mailing output 207
|| (double vertical bar)
and verifying file/directory operations
192
logical or operator 105
1;, and subroutines 124

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This index is from my book, Perl and CGI for the World Wide Web: Visual QuickStart Guide, published by Peachpit Press.