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$string =~ / \w/;  # a space followed by a word character
$string =~ /\s\w/; # any whitespace character followed by a word chara
+cter
$string =~ /\s\S/; # any whitespace character followed by a non-whites
+pace character

#!/usr/bin/env perl
use 5.010; use strict; use warnings;
...
    say;                 # do stuff with the line or elements
  }
}

                 Rate split and check check and split
split and check 145/s              --             -1%
check and split 146/s              1%              --

                 Rate check and split split and check
check and split 112/s              --            -17%
split and check 136/s             21%              --

#!/usr/bin/env perl
use 5.010; use strict; use warnings;
...
        }
    }
}