Remove '--import' from regex string match tests

The '--import' flag was used for importing named capture groups, but it
was decided to always import them unconditionally. This flag was causing
the tests to fail.

tests/checks/regex-import.fish

@@ -2,32 +2,32 @@
 # Tests for importing named regex groups as fish variables
 
 # Capture first match
-echo "hello world" | string match --regex -q --import -- '(?<words>[^ ]+) ?'
+echo "hello world" | string match --regex -q -- '(?<words>[^ ]+) ?'
 printf "%s\n" $words
 # CHECK: hello
 
 # Capture multiple matches
-echo "hello world" | string match --regex -q --import --all -- '(?<words>[^ ]+) ?'
+echo "hello world" | string match --regex -q --all -- '(?<words>[^ ]+) ?'
 printf "%s\n" $words
 # CHECK: hello
 # CHECK: world
 
 # Capture multiple variables
-echo "hello world" | string match -rqI -- '^(?<word1>[^ ]+) (?<word2>.*)$'
+echo "hello world" | string match -rq -- '^(?<word1>[^ ]+) (?<word2>.*)$'
 printf "%s\n" $word1 $word2
 # CHECK: hello
 # CHECK: world
 
 # Clear variables on no match
 set foo foo
-echo "foo" | string match -rqI -- '^(?<foo>bar)$'
+echo "foo" | string match -rq -- '^(?<foo>bar)$'
 echo $foo
 # CHECK:
 
 # Named group may be empty in some of the matches
 set word
 set punctuation
-echo "hello world, boy!" | string match -a -qrI -- '(?<word>[^ .,!;]+)(?<punctuation>[.,!;])?'
+echo "hello world, boy!" | string match -a -qr -- '(?<word>[^ .,!;]+)(?<punctuation>[.,!;])?'
 echo $word
 # CHECK: hello world boy
 printf "%s\n" $punctuation