Removing whitespace from strings in Java
I have a string like this:
mysz = "name=john age=13 year=2001";
I want to remove the whitespaces in the string. I tried
trim() but this removes only whitespaces before and after the whole string. I also tried
replaceAll("\\W", "") but then the
= also gets removed.
How can I achieve a string with:
mysz2 = "name=johnage=13year=2001"
st.replaceAll("\\s+","") removes all whitespaces and non-visible characters (e.g., tab,
st.replaceAll("\\s","") produce the same result.
The second regex is 20% faster than the first one, but as the number consecutive spaces increases, the first one performs better than the second one.
Assign the value to a variable, if not used directly:
st = st.replaceAll("\\s+","")
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\w = Anything that is a word character
\W = Anything that isn't a word character (including punctuation etc)
\s = Anything that is a space character (including space, tab characters etc)
\S = Anything that isn't a space character (including both letters and numbers, as well as punctuation etc)
(Edit: As pointed out, you need to escape the backslash if you want
\s to reach the regex engine, resulting in
The most correct answer to the question is:
String mysz2 = mysz.replaceAll("\\s","");
I just adapted this code from the other answers. I'm posting it because besides being exactly what the question requested, it also demonstrates that the result is returned as a new string, the original string is not modified as some of the answers sort of imply.
(Experienced Java developers might say "of course, you can't actually modify a String", but the target audience for this question may well not know this.)
If you need to remove unbreakable spaces too, you can upgrade your code like this :