Search/Replace for/with php variable name

Hi all.
I have just updated from Dreamweaver 5 to 5.5 and now I am missing a very handy functionality.
What I want to do is to replace all occurences of $a with $b.
In Dreamweaver 5 that was very easy by using "Find and replace":
Find in: All open documents
Search: Sourcecode
Find: $a
Replace: $b
Active options: Match case and Match whole word !!!!
Now in Dreamweaver 5.5 the option "Match whole word" is automatically disabled as soon as I enter a $ (dollar) in the search field.
I assume this has something to do with regular expressions but I do NOT check the option "Regular expression" in the search and replace dialog.
Is this a bug?
What are my options now.
If I don't have the possibility to to tick "Match whole word" my search does also replace all occurrences of $abc and $answer etc. with $b.
Thank you for your help

samet2011 wrote:
I have Dreamweaver 5 and 5.5 running parallel on my computer.
I can confirm that the way I described and used to use is working on Dreamweaver 5.
I was the person who informed Murray that Dreamweaver CS5 and CS5.5 both behave the same way. I have just checked as far back as CS3, and it also disables "Match whole word" when you enter a dollar sign in the Find field of the Find and Replace dialog box. In fact, that option is disabled whenever you enter any nonalphanumeric character (except an underscore) in that field. It's not limited to dollar signs.
Why it's not disabled in your version of CS5 is a mystery.
However, to solve your problem, you don't need either a regex or "Match whole word". Simply type the name of your PHP variable followed by a space into the Find field. Also add a space after the name of the variable you're using as the replacement.
What "Match whole word" does under the hood is to use a regular expression to find a word break. As long as you leave a space between your variables and any following code, simply adding the space to your search will do the trick.
However, if you have cases where a variable is followed by a comma, closing parenthesis, or some other character, you will need to use the following regex:
Find: \$variable_name\b
Replace: $new_name
The \$ looks for a dollar sign. The variable_name matches the literal text of the variable name (replace it with the actual text you're looking for). The \b matches a word break in exactly the same way as "Match whole word".
In the Replace field, $new_name is the literal name of the new variable.

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