Книги автора: Fedora™ Unleashed, 2008 edition
/ Книги автора: Fedora™ Unleashed, 2008 edition
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Книга: Fedora™ Unleashed, 2008 edition
Comparison Operators
Comparison Operators
The comparison operators used by Perl are similar to those used by C, awk, and the csh shells, and are used to specify and compare values (including strings). Most frequently, a comparison operator is used within an if statement or loop. Perl has comparison opera tors for numbers and strings. Table 25.1 shows the numeric comparison operators and their behavior.
TABLE 25.1 Numeric Comparison Operators in Perl
| Operator | Meaning |
|---|---|
== |
Is equal to |
< |
Less than |
> |
Greater than |
<= |
Less than or equal to |
>= |
Greater than or equal to |
!= |
Not equal to |
.. |
Range of >= first operand to <= second operand |
<=> |
Returns -1 if less than, 0 if equal, and 1 if greater than |
Table 25.2 shows the string comparison operators and their behaviors.
TABLE 25.2 String Comparison Operators in Perl
| Operator | Meaning |
|---|---|
eq |
Is equal to |
lt |
Less than |
gt |
Greater than |
le |
Less than or equal to |
ge |
Greater than or equal to |
ne |
Not equal to |
cmp |
Returns -1 if less than, 0 if equal, and 1 if greater than |
=~ |
Matched by regular expression |
!~ |
Not matched by regular expression |
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