Remove space from a string

Question

Say I have a string like this:

set str "BAT-CAT, DOG,ELEPHANT ,LION & MOUSE-ANT ,MONKEY, DONKEY"

Now I want to get STRING as follows:

"BAT-CAT,DOG,ELEPHANT,LION&MOUSE-ANT,MONKEY,DONKEY"

I am using trim function to remove white space but it is not working kindly suggest any regsub or procedure for same thank you

`trim` strips white space only from the beginning and end of the string [trim on php.net](http://php.net/manual/en/function.trim.php) — xpy, Dec 05 '13 at 07:48

score 7 · Answer 1 · answered Dec 05 '13 at 10:25

7

The best way to remove all spaces from a string is to use string map:

set stripped [string map {" " ""} $originalString]

answered Dec 05 '13 at 10:25

Donal Fellows

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score 2 · Answer 2 · answered Dec 05 '13 at 07:35

2

regsub -all { } $str ""

This will return: BAT-CAT,DOG,ELEPHANT,LION&MOUSE-ANT,MONKEY,DONKEY

answered Dec 05 '13 at 07:35

Javide

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score 2 · Answer 3 · answered Dec 05 '13 at 08:31

Another solution is this one.

join [list {*}$str] ""

Using the {*} operator, from Tcl parser point of you writing something like:

join [list BAT-CAT, DOG,ELEPHANT ,LION & MOUSE-ANT ,MONKEY, DONKEY] ""

Now, the list command will create a new list where every element is one of its parameters, and the white spaces are used as parameter separators.

Finally, the join command takes a list as its former parameter and a separator as its latter parameter and build a string formed by the list items separated by the separator. In this case, I'm using the empty string as separator, so the resulting string is composed from list items without anything among them.

You can do it also using this simpler syntax

join $str ""

Remove space from a string

3 Answers3