Android Question [B4X] Regex - remove whitespaces

Alexander Stolte · Jul 21, 2020

Hey,

i found this code on stackoverflow to remove whitespaces:

B4X:

st.replaceAll("\\s","")

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...

stackoverflow.com

on B4A i tried this:

B4X:

Regex.Replace("\\s",New, "")

but it is not working.

Erel · Jul 21, 2020

B4X:

Regex.Replace("\s", New, "")

Mahares · Jul 21, 2020

The OP may have a reason for using RegEx, but for those of us who get intimidated by RegEx, for simple replacement, I use:

B4X:

str=str.Replace(" ","")

instead of:

B4X:

str= Regex.Replace("\s", str, "")

Both are equivalent.

Alexander Stolte · Jul 21, 2020

Mahares said:
str=str.Replace(" ","")

and then i write more than one whitespace and your code wont work.

Erel · Jul 21, 2020

The difference is that \s will capture:

A space character
A tab character
A carriage return character
A new line character
A vertical tab character
A form feed character

(https://www.w3schools.com/jsref/jsref_regexp_whitespace.asp)

The str.Replace code will only capture spaces.

Mahares · Jul 21, 2020

Alexander Stolte said:
and then i write more than one whitespace and your code wont work.

I looked at your StackOverflow link and the example was regarding a space character. That is why I referred to it as ' simple replacement' and that is how I based my post.

Erel · Jul 21, 2020

To complete this discussion, it is worth mentioning String.Trim, which removes prefix and suffix whitespace.

B4X:

str.Trim 'can this line do something? No. Strings are immutable. Should be:
str = str.Trim

Android Question [B4X] Regex - remove whitespaces

Alexander Stolte

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Removing whitespace from strings in Java

Erel

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Mahares

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Alexander Stolte

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Erel

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Mahares

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Erel

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Android Question [B4X] Regex - remove whitespaces

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