how to check url js code example

Example 1: check if url contains string

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
  $(document).ready(function() {
    if (window.location.href.indexOf("franky") > -1) {
      alert("your url contains the name franky");
    }
  });
</script>

Example 2: javascript url check

const isAbsoluteUrl = url => /^[a-z][a-z0-9+.-]*:/.test(url);

// Example
isAbsoluteUrl('https://1loc.dev');          // true
isAbsoluteUrl('https://1loc.dev/foo/bar');  // true
isAbsoluteUrl('1loc.dev');                  // false
isAbsoluteUrl('//1loc.dev');