JavaScript - Replace all commas in a string
JavascriptStringReplaceSubstitutionJavascript Problem Overview
I have a string with multiple commas, and the string replace method will only change the first one:
var mystring = "this,is,a,test"
mystring.replace(",","newchar", -1)
Result: "thisnewcharis,a,test"
The documentation indicates that the default replaces all, and that "-1" also indicates to replace all, but it is unsuccessful. Any thoughts?
Javascript Solutions
Solution 1 - Javascript
The third parameter of String.prototype.replace()
function was never defined as a standard, so most browsers simply do not implement it.
regular expression with g
(global) flag.
The best way is to use var myStr = 'this,is,a,test'; var newStr = myStr.replace(/,/g, '-');
console.log( newStr ); // "this-is-a-test"
Still have issues?
It is important to note, that regular expressions use special characters that need to be escaped. As an example, if you need to escape a dot (.
) character, you should use /\./
literal, as in the regex syntax a dot matches any single character (except line terminators).
var myStr = 'this.is.a.test'; var newStr = myStr.replace(/./g, '-');
console.log( newStr ); // "this-is-a-test"
If you need to pass a variable as a replacement string, instead of using regex literal you may create RegExp
object and pass a string as the first argument of the constructor. The normal string escape rules (preceding special characters with \
when included in a string) will be necessary.
var myStr = 'this.is.a.test'; var reStr = '\.'; var newStr = myStr.replace(new RegExp(reStr, 'g'), '-');
console.log( newStr ); // "this-is-a-test"
Solution 2 - Javascript
Just for fun:
var mystring = "this,is,a,test"
var newchar = '|'
mystring = mystring.split(',').join(newchar);
Solution 3 - Javascript
var mystring = "this,is,a,test"
mystring.replace(/,/g, "newchar");
Use the global(g
) flag