I have the following preg\_replace function

```
preg_replace('/[\$,Audio, CD, Audiobook, MP3 Audio, Unabridged]/','',$audibleinnertextpieces)

```

this is my regular expression to replace either the $ or the WHOLE string 

```
Audio, CD, Audiobook, MP3 Audio, Unabridged

```

for some reason it is removing the U in all my strings, I just want to replace if the WHOLE string is found to match `Audio, CD, Audiobook, MP3 Audio, Unabridged`