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To remove leading and trailing spaces in Java, use the trim() method. This method returns a copy of this string with leading and trailing white space removed, or this string if it has no leading or trailing white space.
trim() method is used to remove the white spaces from both the ends of the given string. Return value: This method returns a new string, without any of the leading or the trailing white spaces. In this example the trim() method removes all the leading and the trailing spaces in the string str.
The lstrip() method will remove leading whitespaces, newline and tab characters on a string beginning.
Type M-x delete-trailing-whitespace to delete all trailing whitespace. This command deletes all extra spaces at the end of each line in the buffer, and all empty lines at the end of the buffer; to ignore the latter, change the variable delete-trailing-lines to nil .
See the String method trim() - https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/Trim
var myString = ' bunch of <br> string data with<p>trailing</p> and leading space ';
myString = myString.trim();
// or myString = String.trim(myString);
Edit
As noted in other comments, it is possible to use the regex approach. The trim method is effectively just an alias for a regex:
if(!String.prototype.trim) {
String.prototype.trim = function () {
return this.replace(/^\s+|\s+$/g,'');
};
}
... this will inject the method into the native prototype for those browsers who are still swimming in the shallow end of the pool.
var str = " my awesome string "
str.trim();
for old browsers, use regex
str = str.replace(/^[ ]+|[ ]+$/g,'')
//str = "my awesome string"
string.replace(/^\s+|\s+$/g, "");
I know this is a very old question but it still doesn't have an accepted answer. I see that you want the following removed: html tags that are "empty" and white spaces based on an html string.
I have come up with a solution based on your comment for the output you are looking for:
Trimming using JavaScript<br /><br /><br /><br />all leading and trailing white spaces
var str = "<p> </p><div> </div>Trimming using JavaScript<br /><br /><br /><br />all leading and trailing white spaces<p> </p><div> </div>";
console.log(str.trim().replace(/ /g, '').replace(/<[^\/>][^>]*><\/[^>]+>/g, ""));.trim() removes leading and trailing whitespace
.replace(/ /g, '') removes
.replace(/<[^\/>][^>]*><\/[^>]+>/g, "")); removes empty tags
If you're working with a multiline string, like a code file:
<html>
<title>test</title>
<body>
<h1>test</h1>
</body>
</html>
And want to replace all leading lines, to get this result:
<html>
<title>test</title>
<body>
<h1>test</h1>
</body>
</html>
You must add the multiline flag to your regex, ^ and $ match line by line:
string.replace(/^\s+|\s+$/gm, '');
Relevant quote from docs:
The "m" flag indicates that a multiline input string should be treated as multiple lines. For example, if "m" is used, "^" and "$" change from matching at only the start or end of the entire string to the start or end of any line within the string.
01). If you need to remove only leading and trailing white space use this:
var address = " No.255 Colombo "
address.replace(/^[ ]+|[ ]+$/g,'');
this will return string "No.255 Colombo"
02). If you need to remove all the white space use this:
var address = " No.255 Colombo "
address.replace(/\s/g,"");
this will return string "No.255Colombo"
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