Replace all Commas in a String using JavaScript

Replace all Commas in a String #

Use the replaceAll() method to replace all commas in a string, e.g. str.replaceAll(',', ' '). The replaceAll method takes a substring and a replacement as parameter and returns a new string with all matches replaced by the provided replacement.

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const str = 'a,long,string';

const commasReplaced = str.replaceAll(',', ' ');
console.log(commasReplaced); // 👉️ a long string

We passed the following parameters to the String.replaceAll method:

1. a substring we're looking to match in the string, in our case a comma ,
2. the replacement for each match

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const str = 'a,long,string';

const commasReplaced = str.replaceAll(',', '_');
console.log(commasReplaced); // 👉️ a_long_string

Note that the replaceAll method does not change the original string, it returns a new string with all matches replaced by the provided replacement.

Use the replace() method to replace all commas in a string, e.g. str.replace(/,/g, ' '). The method takes a regular expression and a replacement string as parameters and returns a new string with the matches replaced by the provided replacement.

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const str = 'a,long,string';

const commasReplaced = str.replace(/,/g, ' ')
console.log(commasReplaced) // 👉️ a long string

We passed the following parameters to the String.replace method:

1. a regular expression matching all commas in the string
2. a replacement for each match

We used the g (global) flag because we want to match all commas in the string and not just the first occurrence.

In the example we replaced each comma with a space, however you can provide a replacement string that suites your use case.

The replaceAll method is quite a bit easier to read than replace, however if you have to support Internet Explorer, replace gets the job done.

Further Reading #

• How to get the Union of Two Sets in JavaScript
• How to iterate a Map using JavaScript