可以说我有一个包含以下信息的文件learning.txt：
A *
B &
C (
D )
如何获取用户输入的字符串abc并返回*&(
Perl中有一个非常有效的（O（N + M））解决方案
my %replace = ( A => '*', B => '&', C => '(', D => ')' );
my $re = join '|', map quotemeta, keys %replace;
$re = qr/($re)/;
# and somewhere else in the scope with $re and %replace
s/$re/$replace{$1}/g;
但是对于不区分大小写的情况，它有点复杂
use feature qw(fc); # since v5.16 use lc otherwise
my %replace = ( A => '*', B => '&', C => '(', D => ')' );
my $re = join '|', map quotemeta, keys %replace;
$re = qr/($re)/i;
my %replace_fc;
@replace_fc{ map fc, keys %replace } = values %replace;
# and somewhere else in the scope with $re and %replace_fc
s/$re/$replace_fc{fc $1}/g;
只给%replace您的文件中像这样
while (<>) {
my ($key, $val) = split;
$replace{$key} = $val;
}
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我来说两句