Question

$arg=TEST #### Requested, NOT AVAILABLE psy #;

I have a string above where the # is dynamically generated.
I have to use a function in tcl to do a string replacement.
Basically I need to remove the comma(,) form the above expression and display it as

TEST #### Requested NOT AVAILABLE psy #

Here’s what I did, but it is not working.

regsub -all {"Requested,"} $arg {"Requested"} arg

This is where i referenced the function from:
http://www.tcl.tk/man/tcl8.5/TclCmd/regsub.htm

Answer 1

The problem is your quoting. You are actually checking for the string "Requested," (including the quotes), but that isn’t what you want. Try either getting rid of the squiggly-brackets (}) or double quotes ("):

set arg "TEST #### Requested, NOT AVAILABLE psy #;"
regsub -all "Requested," $arg "Requested" arg

If all you need to get rid of is the comma, you can search/replace that (just replace it with the empty string ""):

regsub -all "," $arg "" arg

or

regsub -all {,} $arg {} arg

As a commenter had mentioned, the latter may be better in the general case, since regular expressions often contain many backslashes (/) and the {} brackets don’t require massive amounts of distracting extra backslash escapes the same way that "" quotes do.