Question

How to replace the last occurrence of character in string with TypeScript

Answer 1

let str: string = 'javascript typescript node.js php';
   
const lastIndex: number = str.lastIndexOf('t');
  
const replace_char: string = 'W';
  
str = str.substring(0, lastIndex) + replace_char + str.substring(lastIndex + 1);
   
console.log(str); 
 
     
     
     
/*
run:
     
"javascript typescripW node.js php" 
     
*/

 

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Answer 2

let str: string = 'javascript typescript node.js php';
   
const replace_char: string = 'W';
  
str = str.replace(/t([^t]*)$/, replace_char + '$1')
   
console.log(str); 
 
     
     
     
/*
run:
     
"javascript typescripW node.js php" 
     
*/

 

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