newbie question: how to replace a character with nothing

> Greetings.  I found a useful method.  Only thing is
> I don't know how to write the character code for no character.
>
> '12%31%%1232' replaceAll: $% with: $.   '12.31..1232'
>
> '12%31%%1232' replaceAll: $% with: $* '12*31**1232'
>
> '12%31%%1232' replaceAll: $% with: ''  ==> error
> '12%31%%1232' replaceAll: $% with: Nil  ==> error
>
>
> I looked for a deleteAll: method but there is none for Strings.

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> Thank you for your help.
>
> Joe.
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> On Thu, 25 Oct 2012, Joseph J Alotta wrote:
>
> >Greetings.  I found a useful method.  Only thing is
> >I don't know how to write the character code for no character.
> >
> >'12%31%%1232' replaceAll: $% with: $.   '12.31..1232'
> >
> >'12%31%%1232' replaceAll: $% with: $* '12*31**1232'
> >
> >'12%31%%1232' replaceAll: $% with: ''  ==> error
> >'12%31%%1232' replaceAll: $% with: Nil  ==> error
> >
> >
> >I looked for a deleteAll: method but there is none for Strings.
>
> Since the size of Strings (and Objects in general) can't be changed in
> Squeak, and removing characters would change the size, therefore you have
> to use a method which creates a new object instead of just modifying the
> receiver. Here are a few possibilities:
>
> '12%31%%1232' copyWithout: $%.
> '12%31%%1232' copyReplaceAll: '%' with: ''.
> '12%31%%1232' reject: [ :each | each = $% ].
> '12%31%%1232' select: [ :each | each ~= $% ].
>
>
> Levente
>
> P.S.: While #replaceAll:with: looks useful, it's a bit dangerous, because
> it changes the receiver. So you'll have to be more careful when you use
> it.
>