I use RegExp and "string".match very rarely so I'm not so sure how to use them for some little bit complex things.Here's what I would like to do and don't know how to do it. Here I have a string in javascript.

var str= " I would like to know how to use RegExp    ,    string.match    and  string.replace"

I would like to delete all white spaces BETWEEN comma and any letter.So after that this string will look like this.

    str= " I would like to know how to use RegExp,string.match    and  string.replace"

I only know how to delete all white spaces from string using this-->

str = str.replace(/\s/g, "")

I use RegExp and "string".match very rarely so I'm not so sure how to use them for some little bit complex things.Here's what I would like to do and don't know how to do it. Here I have a string in javascript.

var str= " I would like to know how to use RegExp    ,    string.match    and  string.replace"

I would like to delete all white spaces BETWEEN comma and any letter.So after that this string will look like this.

    str= " I would like to know how to use RegExp,string.match    and  string.replace"

I only know how to delete all white spaces from string using this-->

str = str.replace(/\s/g, "")

• javascript
• regex
• string
• str-replace

5 Answers 5

That should work:

str = str.replace(/\s*,\s*/g, ",");

var str = " I would like to know how to use RegExp    ,    string.match    and  string.replace";

console.log(
  str
);
console.log(
  str
  //Replace double space with single
  .replace(/  +/ig, ' ')
);
console.log(
  str
  //Replace double space with single
  .replace(/  +/ig, ' ')
  //Replace any amount of whitespace before or after a `,` to nothing
  .replace(/\s*,\s*/ig, ',')
);

Simply use RegEx:

\s*,\s*

DEMO

You can play around with regex expressions and get a decent documentation of the language features on https://regex101.com

Here is this.lau_'s solution of your problem: https://regex101.com/r/aT7pS5/1

I would even suggest a better one that includes quotes:

const text: string = 'Example "number-1" , something “ABC” , and something more.';

const regex: RegExp = /\s(?=[,"”])/g;
const resultat: string = text.replace(regex, '');

Example "number-1", something “ABC”, and something more.