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Perl - 96 (or 71) characters 87 (or 62) characters

This is what I came up with in Perl. Went through a few different ways to do it but this seemed shortest from what I can think of so far, at 97 characters.

use List::Util 'shuffle';sub r{($b,@w)=split//,$_[0];$e=pop(@w);return$b.join('',shuffle@w).$e;}

Though, if you cut out the 'use' line (which I guess is valid, since others excluded #include lines in their C programs) I can cut it down further to 71 characters:

sub r{($b,@w)=split//,$_[0];$e=pop(@w);return$b.join('',shuffle@w).$e;}

EDIT It was suggested that I try doing this implementing @tobius' method. This way I got it down to 87 characters, or by removing the use line, 62 characters:

use List::Util 'shuffle';sub r{$_[0]=~m/(.)(.+)(.)/;$1.join('',shuffle split//,$2).$3;}

Perl - 96 (or 71) characters 84 (or 59) characters

This is what I came up with in Perl. Went through a few different ways to do it but this seemed shortest from what I can think of so far, at 97 characters.

use List::Util 'shuffle';sub r{($b,@w)=split//,$_[0];$e=pop(@w);return$b.join('',shuffle@w).$e;}

Though, if you cut out the 'use' line (which I guess is valid, since others excluded #include lines in their C programs) I can cut it down further to 71 characters:

sub r{($b,@w)=split//,$_[0];$e=pop(@w);return$b.join('',shuffle@w).$e;}

EDIT It was suggested that I try doing this implementing @tobius' method. This way I got it down to 84 characters, or by removing the use line, 59 characters:

use List::Util 'shuffle';sub r{$_[0]=~m/(.)(.+)(.)/;$1.join'',shuffle split//,$2.$3}

Perl - 97 characters (or 71 characters)

This is what I came up with in Perl. Went through a few different ways to do it but this seemed shortest from what I can think of so far, at 97 characters.

use List::Util 'shuffle';sub r{($b,@w)=split//,$_[0];$e=pop(@w);return$b.join('',shuffle@w).$e;}

Though, if you cut out the 'use' line (which I guess is valid, since others excluded #include lines in their C programs) I can cut it down further to 71 characters:

sub r{($b,@w)=split//,$_[0];$e=pop(@w);return$b.join('',shuffle@w).$e;}

EDIT It was suggested that I try doing this implementing @tobius' method. This way I got it down to 87 characters, or by removing the use line, 62 characters:

use List::Util 'shuffle';sub r{$_[0]=~m/(.)(.+)(.)/;$1.join('',shuffle split//,$2).$3;}

Perl - 96 (or 71) characters 87 (or 62) characters

This is what I came up with in Perl. Went through a few different ways to do it but this seemed shortest from what I can think of so far, at 97 characters.

use List::Util 'shuffle';sub r{($b,@w)=split//,$_[0];$e=pop(@w);return$b.join('',shuffle@w).$e;}

Though, if you cut out the 'use' line (which I guess is valid, since others excluded #include lines in their C programs) I can cut it down further to 71 characters:

sub r{($b,@w)=split//,$_[0];$e=pop(@w);return$b.join('',shuffle@w).$e;}

EDIT It was suggested that I try doing this implementing @tobius' method. This way I got it down to 87 characters, or by removing the use line, 62 characters:

use List::Util 'shuffle';sub r{$_[0]=~m/(.)(.+)(.)/;$1.join('',shuffle split//,$2).$3;}

Perl - 97 characters (or 71 characters)

This is what I came up with in Perl. Went through a few different ways to do it but this seemed shortest from what I can think of so far, at 97 characters.

use List::Util 'shuffle';sub r{($b,@w)=split//,$_[0];$e=pop(@w);return$b.join('',shuffle@w).$e;}

Though, if you cut out the 'use' line (which I guess is valid, since others excluded #include lines in their C programs, I can cut it down further to 71 characters:

sub r{($b,@w)=split//,$_[0];$e=pop(@w);return$b.join('',shuffle@w).$e;}

Perl - 97 characters (or 71 characters)

This is what I came up with in Perl. Went through a few different ways to do it but this seemed shortest from what I can think of so far, at 97 characters.

use List::Util 'shuffle';sub r{($b,@w)=split//,$_[0];$e=pop(@w);return$b.join('',shuffle@w).$e;}

Though, if you cut out the 'use' line (which I guess is valid, since others excluded #include lines in their C programs) I can cut it down further to 71 characters:

sub r{($b,@w)=split//,$_[0];$e=pop(@w);return$b.join('',shuffle@w).$e;}

EDIT It was suggested that I try doing this implementing @tobius' method. This way I got it down to 87 characters, or by removing the use line, 62 characters:

use List::Util 'shuffle';sub r{$_[0]=~m/(.)(.+)(.)/;$1.join('',shuffle split//,$2).$3;}