替换特定字符前后的空格 - Javascript

Question

Is there a way to replace space before and after a particular character in Javascript?

Scenario: string - "( 'fever' ) OR ( 'cold' )"

I just want to remove spaces before and after single quotes

expected result - "('fever') OR ('cold')"

Thanks In Advance

Answer 1

You can use a regex:

 const s = "( 'fever' ) OR ( 'cold' )" const out = s.replace(/(?:\s+('\w+')\s+)/g, '$1') console.log(out)

Answer 2

The question is tagged regex, but sometimes I would just do something like this:

function replaceAll(before, after, string) {
  let result = string;
  while (result.indexOf(before) !== -1) {
    result = result.replace(before, after);
  }
  return result;
}
let example = "( 'fever' ) OR ( 'cold' )";
example = replaceAll("' ", "'", example);
example = replaceAll(" '", "'", example);
console.log(example);

Answer 3

You can use lookaround like this:

 const s = "( 'fever' ) OR ( 'cold' )" const out = s.replace(/(?<=\()\s+|\s+(?=\))/g, '') console.log(out)

Where:

• (?<=\()\s+ matches 1 or more spaces preceded by an opening parenthese
• \s+(?=\)) matches 1 or more spaces followed by a closing parenthese

---

You can also use this:

 const s = "( 'fever' ) OR ( 'cold' )" const out = s.replace(/(?<=')\s+|\s+(?=')/g, '') console.log(out)

Where:

• (?<=')\s+ matches 1 or more spaces preceded by a single quote
• \s+(?=') matches 1 or more spaces followed by a single quote