Regular Expressions

[Err]

I need some help with a regex I'm trying to create for a replace function. This is how I want it set up:[0-9A-Za-z][one space][0-9A-Za-z]I'm trying to prevent spaces from being entered for the first character and prevent extra (two or more) spaces between letters. I have been trying to create my own for a while but I haven't had any luck, this is the best that I have:

str.replace(/([^a-zA-Z0-9]){1}\s/g,'');

The above code removes extra spaces but allows spaces for the first character. Any help with this would be great.

[Ingolme]

Go listing all the rules you want to follow and then translate them to the regular expression. You haven't explained yourself well so I can't be sure that the answer I give you is what you want.This expression must begin with a-zA-Z0-9, it can have spaces between the words, but must end with a character:

/^([a-zA-Z0-9]+\s?)+[a-zA-Z0-9]$/g

[Err]

I tried the code, it didn't work correctly. It allowed spaces for the first character. Let me explain a little more. I want to replace beginning and extra spaces in a string.Allowed Characters: [0-9a-zA-Z\s]So something like this:

	  beginning   and extra  spaces  here

I want to turn into this:

beginning and extra spaces not here

For example purposes I put together a very short example of what I'm working with.

<input type="text" name="txt" onkeyup="return validate();" />function validate() {  txt = document.getElementsByName('txt')[0];  txt.value = txt.value.replace(/^([a-zA-Z0-9]+\s?)+[a-zA-Z0-9]$/g, '');}

Please keep in mind that I'm just getting into regular expressions and the concepts behind it seem a bit confusing for me. But if I'm starting to create expressions myself that work, then I'm progressively getting better with them.