Example 1: Replace All Occurrence of String Using RegEx
// program to replace all occurrence of a string
const string = 'Mr Red has a red house and a red car';
// regex expression
const regex = /red/gi;
// replace the characters
const newText = string.replace(regex, 'blue');
// display the result
console.log(newText);
Output
Mr blue has a blue house and a blue car
In the above program, a regex expression is used as the first parameter inside the replace() method.
/g refers to global (that replacement is done across the whole string) and /i refers to case-insensitive.
The replace() method takes the string that you want to replace as the first parameter and the string you want to replace with as the second parameter.
Example 2: Replace All Occurrence of String Using built-in Method
// program to replace all occurrence of a string
const string = 'Mr red has a red house and a red car';
const result = string.split('red').join('blue');
console.log(result);
Output
Mr blue has a blue house and a blue car
In the above program, the built-in split() and join() method is used to replace all the occurrences of the string.
- The string is split into individual array elements using the split() method.
Here,string.split('red')gives ["Mr ", " has a ", " house and a ", " car"] by splitting the string. - The array elements are joined into a single string using the
join()method.
Here,reverseArray.join('blue')gives Mr blue has a blue house and a blue car by joining the array elements.
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