用Perl中的空格匹配子字符串

Question

I am trying to match a sub-string with a given string in perl.

Match is failing when the sub-string contains space.

Example:

Please consider the following string variable:

var = "test [abc], def, xyz,"

The expression:

($var=~ m/test [abc]/)

doesn't return 1.

Strings without spaces are working fine:

Example:

($var=~ m/def/)

is returning 1.

Please help.

Thanks

Answer 1

[ and ] in regex have special meaning. They define character classes. If you want to match a [ or a ] , you need to escape them:

$var=~ m/test \[abc\]/

Answer 2

[] are character class in regex. you have to escape those:

($var=~ m/test \[abc\]/)

In your example test [abc] will match test a , test b or test c . Cause [abc] means any of a,b,c