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表达式中的运算符EQ NE GT GE LT LE…..

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EQ NE GT GE LT LE

GT=Great Than >
EQ=Equal =
GE=Great and Equal >=
NE=Not Equal <>

//等运算符,如果运算符两边相同则返回真,否则返回假;

NE(Not Equal to)
//不等运算符,如果运算符两边不等则返回真,否则返回假;

GE(Greater than or equal to)
//大于等于运算符,如果运算符两边左边大于等于右边则返回真,否则返回假;

GT(Greater than)
//大于运算符,如果运算符两边左边大于右边则返回真,否则返回假;

LE(Less than or equal to)
//小于等于运算符,如果运算符两边左边小于等于右边则返回真,否则返回假;

LT(Less than)
//小于运算符,如果运算符两边左边大于右边则返回真,否则返回假;

类别 运算符

算术运算符 + 、 - 、 * 、 / (或 div )和 % (或 mod ) 
关系运算符 == (或 eq )、 != (或 ne )、 < (或 lt )、 > (或 gt )、 <= (或 le )和 >= (或 ge ) 
逻辑运算符 && (或 and )、 || (或 or )和 ! (或 not ) 
验证运算符 empty

参考及引用

7.2. String Comparison Operators

In order to compare for string equality, or if one string is alphabetically bigger than another, you can use the six string comparison operators. Here are the string operators together with the numerical operators they correspond too:

String Operator Numerical Operator
eq ==
ne !=
gt >
lt <
ge >=
le <=

Notice that the string operators are built from the initials of their abbreviated names. (E.g: eq = equal, gt = greater than). Perl’s string comparison is case-sensitive. If you want a case insensitive string comparison, use thelc function to convert the strings to lowercase beforehand.

Example:

print "Please enter your private name:\n";
$name = <>;
chomp($name);
if (lc($name) eq "rachel")
{
    print "Your name is Rachel!\n";
}
else
{
    print "Your name is not Rachel!\n";
} 

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