Help: 1. transpose individual characters 2. Reverse a string

[Tiger_Tom]

Can Javascript do these sorts of
regular expressions:

1. Transpose individual characters in a string
e.g.
swop ewAr455MN for 12345ABCD, where 1 becomes e,
2 becomes w, 3 becomes A and so on?

2. Reverse a string?

Is there tutorial that explains how to do this
succinctly?

I can do this in Perl, but the JavaScript
tutorials I've found don't seem to offer these
options.

Any clues gratefully received.

[Andrew-J2000]

use regexp to do this

http://tech.irt.org/articles/js049/

heres a quick example

<script type="text/javascript">

  myString = new String('1234567890');

  rExp = /6/gi;

  newString = new String ('m');
  results = myString.replace(rExp, newString);

  document.write(results);

</script> 

this will reverse a string as well

<script type="text/javascript">

  function Rstr(str)
  {
    var rev='';

    for (a = str.length-1; a>=0; i--)
    {
      rev+=str.charAt(a);
    }

    document.write(rev);

  }

</script> 

[Tiger_Tom]

Thanks for taking the trouble to do that.

What I wanted was to do replace one *set* of individual characters with another *in one go*,
basically an associative array, I suppose.

If I understand your code, it replaces only one
character, is that right?

What I'm aiming for is a kind of encryption or encoding of a string, not swopping individual characters. I should have made that clearer.

The characters would be swopped back later, giving
the original string.

Your help has given me some ideas.

[Andrew-J2000]

actually it replaces all occurances

<script type="text/javascript">

  myString = new String('61626364656768669606');

  rExp = /[6]/gi;

  newString = new String ('m');
  results = myString.replace(rExp, newString);

  document.write(results);

</script> 

becomes 'm1m2m3m4m5m7m8mm9m0m'

rExp = /[6]/gi;

as g = global, thus search and replacing the whole string.

[Tiger_Tom]

Ok, thank you.