What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
To remove spaces, tabs, and line breaks everywhere in a Clojure string, use clojure.string/replace with a whitespace regular expression and an empty replacement: (str/replace s #"s+" ""). Unlike str/trim, this removes whitespace inside the string too.
Remove every whitespace run
Require clojure.string, then replace each run matched by s+ with the empty string:
(require '[clojure.string :as str])
(str/replace s #"s+" "")clojure.string/replace replaces all matches when given a regular expression, so this removes whitespace at the beginning, between characters, and at the end of the string. The Clojure string API documents the regex pattern form.
(str/replace " hello t worldn" #"s+" "")
;; => "helloworld"Deleting the separator joins adjacent text. This is useful when whitespace is unwanted in a compact token or identifier, but may be wrong for ordinary prose.
Free tools Windows power users keep installed
One-click scans. No signup required.
#1 Best Overall
Choose whether to trim, delete, or collapse whitespace
| Intent | Clojure expression | Effect |
|---|---|---|
| Remove whitespace from both ends | (str/trim s) |
Preserves whitespace inside the string. |
| Remove whitespace from the left end | (str/triml s) |
Leaves the right end and interior unchanged. |
| Remove whitespace from the right end | (str/trimr s) |
Leaves the left end and interior unchanged. |
| Remove trailing line endings | (str/trim-newline s) |
Targets newline characters at the end, rather than all whitespace throughout. |
| Replace each whitespace run with one space | (-> s str/trim (str/replace #"s+" " ")) |
Trims the ends and preserves word separation while collapsing internal runs. |
The official Clojure string API documentation describes str/trim as removing whitespace from both ends; it does not remove internal whitespace.
(str/trim " hello t worldn")
;; => "hello t world"
(-> " hello t worldn"
str/trim
(str/replace #"s+" " "))
;; => "hello world"Use the same pattern in ClojureScript
The ClojureScript clojure.string API documents the regex pattern form of replace as well. The same expression works for removing matched whitespace:
(require '[clojure.string :as str])
(str/replace s #"s+" "")Be explicit if Unicode whitespace matters
Clojure regex literals compile to java.util.regex.Pattern, as described in the Clojure language guide. The characters matched by a regex whitespace class can depend on the regex engine and its flags. If your application has a strict Unicode whitespace policy, define the exact characters it should remove and test that policy with representative inputs instead of assuming s covers every character your data may contain.
Quick Recap
Best Value
Rank #4
Rank #3
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minute
