RegExp Conditional

Next ❯RegExp Properties


  • turned_in_notConditional
    • x(?=y)
    • x(?!y)
  • To run below examples, try it inside <script> tag, in a basic html file

x(?=y)

It matches x only if x is followed by y

For example : 

var str="10.101";
var pattern=/10(?=1)/g;
alert(str.match(pattern));
// Output: 10

Matches: 10.101

Comment : Match 10 which is followed by 1


x(?!y)

It matches x only if x is not followed by y

For example : 

var str="10.101";
var pattern=/10(?!1)/g;
alert(str.match(pattern));
// Output: 10

Matches: 10.101

Comment : Match 10 which is not followed by 1



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