[OS X TeX] grep with TexShop

[Jean-Pierre Gattuso]

Hi:

I do not understand how grep works in the TexShop find window.

For example, I want to remove all carriage returns in a paragraph.  
The search string is "\t" the replace string is " ". I check the box  
"regular expression", search syntax is "grep", escape character is  
"\" and scope is "selection".

This is more or less what I do with BBEdit. With TexShop, the  
sequence above finds "r". How do I use the grep capabilities to find  
invisible characters such as carriage return, tab etc..?

Thanks,
jp
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