How to remove spaces on both sides of a string in nodejs

In nodejs, you can use the replace method and regular expressions to remove spaces on both sides of a string. The syntax is "str.replace(/(^\s*)|(\s*$)/g, " ");" The replace() method is used to replace characters in a string, or to replace a substring that matches a regular expression.

The operating environment of this tutorial: windows10 system, nodejs version 12.19.0, DELL G3 computer.

How to remove spaces on both sides of a string in nodejs

To remove spaces on the left and right ends of a string, you can easily use trim, ltrim or rtrim, but there are no these three built-in methods in js and need to be written manually. The following implementation method uses regular expressions, which is very efficient, and adds these three methods to the built-in methods of the String object.

The method format written as a class is as follows: (str.trim();)

<script language="javascript">
　　 String.prototype.trim=function(){
　　    return this.replace(/(^\s*)|(\s*$)/g, "");
　　 }
　　 String.prototype.ltrim=function(){
　　    return this.replace(/(^\s*)/g,"");
　　 }
　　 String.prototype.rtrim=function(){
　　    return this.replace(/(\s*$)/g,"");
　　 }
　　</script>
　　写成函数可以这样：(trim(str))
　　<script type="text/javascript">
　　 function trim(str){ //删除左右两端的空格
　　     return str.replace(/(^\s*)|(\s*$)/g, "");
　　 }
　　 function ltrim(str){ //删除左边的空格
　　     return str.replace(/(^\s*)/g,"");
　　 }
　　 function rtrim(str){ //删除右边的空格
　　     return str.replace(/(\s*$)/g,"");
　　 }
　　</script>

For more node-related knowledge, please visit: nodejs tutorial! !

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