Re^4: String match in Chinese character

Or use the name of the character if you don't have the codes on the tip of your tongue:

use warnings;
use strict;
use utf8;
use charnames ':full';

my $string = '看【厂家直销 儿童加绒加厚打底裤 中小童冬季】Ib';

binmode STDOUT, ':encoding(UTF-8)';
print "Match: $string\n" while $string =~ /
    \N{LEFT BLACK LENTICULAR BRACKET} (.*?) \N{RIGHT BLACK LENTICULAR BRACKET}
/gx;

The way forward always starts with a minimal test.

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