How to use Regex to get the string between curly braces using JavaScript ?

The problem is to get the string between the curly braces. Here we are going to see different Regular Expressions to get the string.

Approach 1:

  • Selecting the string between the outer curly braces.
  • The RegExp selects the all curly braces, removes them and then get the content.

Example: This example illustrate the above approach .



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<!DOCTYPE HTML>
<html>
  
<head>
    <title>
        How to use Regex to get the string between
        curly braces using JavaScript ?
    </title>
</head>
  
<body style="text-align:center;">
      
    <h1 id="h1" style="color:green;"> 
        GeeksforGeeks 
    </h1>
      
    <p id="GFG_UP" style=
        "font-size: 15px; font-weight: bold;">
    </p>
      
    <button onclick="gfg_Run()">
        Click here
    </button>
      
    <p id="GFG_DOWN" style=
        "font-size: 23px; font-weight: bold; color: green; ">
    </p>
      
    <script>
        var el_up = document.getElementById("GFG_UP");
        var el_down = document.getElementById("GFG_DOWN");
        var st = '{This is GeeksforGeeks}';
          
        el_up.innerHTML =
            "Click on the button to get the content between"
            + " the curly brackets.<br> Str = '" + st + "'";
  
        function gfg_Run() {
            st = st.replace(/\{|\}/gi, '');
            el_down.innerHTML = st;
        }
    </script>
</body>
  
</html>

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Output:


    

  • Before clicking on the button:
    

    • 

  • After clicking on the button:
    

    • 



Approach 2:


    

  • In this approach we are selecting the string between the curly braces.
    • 

  • The RegExp selects the string from right side. It looks for the opening curly brace from the rightmost curly brace and print that as string. 
    • 



Example: This example illustrate the above approach .











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                                    edit

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                                    code
                                




















<!DOCTYPE HTML> 


<html> 


  


<head> 


    <title> 


        How to use Regex to get the string between 


        curly braces using JavaScript ? 


    </title> 


</head> 


  


<body style="text-align:center;"> 


      


    <h1 style="color:green;">  


        GeeksforGeeks  


    </h1> 


      


    <p id="GFG_UP" style= 


        "font-size: 15px; font-weight: bold;"> 


    </p> 


      


    <button onclick="gfg_Run()"> 


        Click here 


    </button> 


      


    <p id="GFG_DOWN" style= 


        "font-size: 23px; font-weight: bold; color: green; "> 


    </p> 


      


    <script> 


        var el_up = document.getElementById("GFG_UP"); 


        var el_down = document.getElementById("GFG_DOWN"); 


        var st = '{This is {GeeksforGeeks}}'; 


          


        el_up.innerHTML = "Click on the button to get the " 


                + "content between the curly brackets.<br>" 


                + "Str = '" + st + "'"; 


  


        function gfg_Run() { 


            st = st.replace(/.*\{|\}/gi, ''); 


            el_down.innerHTML = st; 


        } 


    </script> 


</body> 


  


</html> 



















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Output:


    

  • 
Before clicking on the button:
    


    • 

  • 
After clicking on the button:
    

    

    • 




          
          
          

          

    

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