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my $text = "This is a test for the word blue more things blue and then
+ some very large text with a lot of things blue and done";

my $WANT = "blue";

...
                 (?:$WANT)
                 (?:\s+\w+){0,5}
                /xgi;

a test for the word blue more things blue and then
with a lot of things blue and done

a test for the word blue more things blue and then some very large
with a lot of things blue and done

my $WANT = "blue";

...
                 (?:\s+\w+){0,5}
                 )?
                /xgi;