See also:

• TIP #318: Extend Default Whitespace in 'string trim' Beyond ASCII

escargo 2 Jun 2008 - This also related to behavior discussed in comp.lang.tcl with the subject, "string trim not trimming special space characters" (starting on 4 March 2008).

The characters removed by [string trim string] (with no chars argument) are not all the ones for which [string is space char] returns 1.

I think the tip should also include Unicode nonbreaking spaces.

LV you could either update the TIP page with your concerns, or post a comment over on the TCT mailing list.

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The trimleft will remove the pathname from the beginning of the string and trimright will remove the extension. Remember that this command will not save to a variable, therefore you must set the same or another variable:

  % set foo ../returned../
  ../returned../
  % string trim $foo ./
  returned
  % set foo
  ../returned../
  % set foo [string trim $foo ./]
  returned
  % set foo
  returned

MG While you can use it for filenames, the file command is designed specifically for working with filenames and paths. A more general use is to remove leading/trailing white space from a string, something like...

 (Griffiths) 9 % set foo {
 >             this is a test string    }

             this is a test string
 (Griffiths) 10 % string trim $foo
 this is a test string