What is a good alternative of LTRIM and RTRIM in Java?

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What is a good alternative of JavaScript ltrim() and rtrim() functions in Java?


With a regex you could write:

String s = ...
String ltrim = s.replaceAll("^\\s+","");
String rtrim = s.replaceAll("\\s+$","");

If you have to do it often, you can create and compile a pattern for better performance:

private final static Pattern LTRIM = Pattern.compile("^\\s+");

public static String ltrim(String s) {
    return LTRIM.matcher(s).replaceAll("");
}

From a performance perspective, a quick micro benchmark shows (post JIT compilation) that the regex approach is about 5 times slower than the loop (0.49s vs. 0.11s for 1 million ltrim).

I personally find the regex approach more readable and less error prone but if performance is an issue you should use the loop solution.

L-Trim and R-Trim Alternatives in Java, Learn several methods how to achieve l-trim and r-trim in java. ltrim is then a substring starting at the first non-whitespace character. All the benchmarks first remove the left whitespace, then remove the right whitespace,  What is a good alternative of LTRIM and RTRIM in Java? (6 answers) Closed 5 years ago. I am using a pattern \s\s\s\s(.*) on a String " XYX XYQ WQHY ".


Using regex may be nice, but it's quite a lot slower than a simple trimming functions:

public static String ltrim(String s) {
    int i = 0;
    while (i < s.length() && Character.isWhitespace(s.charAt(i))) {
        i++;
    }
    return s.substring(i);
}

public static String rtrim(String s) {
    int i = s.length()-1;
    while (i >= 0 && Character.isWhitespace(s.charAt(i))) {
        i--;
    }
    return s.substring(0,i+1);
}

Source: http://www.fromdev.com/2009/07/playing-with-java-string-trim-basics.html

Also, there are some libraries providing such functions. For example, Spring StringUtils. Apache Commons StringUtils provides similar functions too: strip, stripStart, stripEnd

StringUtils.stripEnd("abc  ", null)    = "abc"

Remove leading and trailing whitespace in Java (left trim and right , The replaceAll() method takes a regular expression and replaces each substring of this string that matches the regex with the specified replacement. What is a good alternative of LTRIM and RTRIM in Java? 0. reading csv file from java with inverted commas but i want without inverted commas. Related. 1170.


import org.apache.commons.lang3.StringUtils;

private String rTrim(String str) {
    return StringUtils.stripEnd(str, /*stripChars*/" ");
}

private String lTrim(String str) {
    return StringUtils.stripStart(str, /*stripChars*/" ");
}

Java String trim() method, string checks this unicode value before and after the string, if it exists then removes the spaces and returns the omitted string. Based on the answer of @bezmax I had a look at the Spring StringUtils, but it couldn't justify the overload for me of switching to the Spring framework.Therfore I decided to create a Characters class to easily left / right trim strings for any given character(-class).


Guava has CharMatcher trimLeadingFrom and trimTrailingFrom

e.g. CharMatcher.whitespace.trimTrailingFrom(s)

How to remove the last character from a string in Java?, How do you remove the last character of a string in Java? TRIM, LTRIM and RTRIM in Java In java, we have trim() method to remove trailing and leading spaces. Good bless! www.gofastek.com. Reply Delete. Replies. Naveen K


Based on the answer of @bezmax I had a look at the Spring StringUtils, but it couldn't justify the overload for me of switching to the Spring framework. Therfore I decided to create a Characters class to easily left / right trim strings for any given character(-class). The class is available on GitHub.

Characters.valueOf('x').trim( ... )
Characters.valueOf('x').leftTrim( ... )
Characters.valueOf('x').rightTrim( ... )

If you would like to trim for whitespaces, there is a predefined character-class available:

Characters.WHITESPACE.trim( ... )
Characters.WHITESPACE.leftTrim( ... )
Characters.WHITESPACE.rightTrim( ... )

The class does feature also other kinds of character operations, such condense, replace or split.

Trim a string in Java to remove leading and trailing spaces, How do you remove leading and trailing spaces in Java? This function is a replacement of RTRIM and LTRIM to delete all space character before and after a string. SELECT Name, RTRIM(LTRIM(Name)) as RLTrim_name, TRIM(Name) as Trim_name FROM [GoT].[dbo].[character-deaths2] Where Name like '%Aegon Targaryen%' As you can see in the result of the query, TRIM() do the same as RTRIM(LTRIM()).


Java String trim() Method, () method removes whitespace from both ends of a string. Note: This method does not change the original string. Unlike String ‘trim’ method Apache ‘ltrim’ and ‘rtrim’ have three parameters. The first one is the object of string that is to be trim. The second one is the chain to remove from string object and last one is a Boolean value which decides the operation is case insensitive or not. Java String Trim alternative ‘replaceAll’ method Using the String ‘trim’ method is easy to use with no flexibility.


Java String trim() method with Example, The java lang.string.trim()is a built-in function that eliminates leading and trailing spaces. The Unicode value of space character is '\u0020'. The trim() method in java checks this Unicode value before and after the Recommended Posts: Trim​  string functions ascii char_length character_length concat concat_ws field find_in_set format insert instr lcase left length locate lower lpad ltrim mid position repeat replace reverse right rpad rtrim space strcmp substr substring substring_index trim ucase upper numeric functions abs acos asin atan atan2 avg ceil ceiling cos cot count degrees


How to do LTRIM () and RTRIM () in Java?, See here a test running on Ideone . 24.08.2016 / 17:54. How not to allow indexing by search engines? Alternatives  How to remove only trailing spaces of a string in Java and keep leading spaces? MySQL select fields containing leading or trailing whitespace What is a good alternative of LTRIM and RTRIM in Java?