check if the page url contain specific text

Does not work in AEM 6.4 GA.

You can try using a small use js file and pass it the test string value as shown below:

Or go for Java.

filepath.js:

use(function () {
    var testStr= this.value;
    var retValue = currentPage.path.toLowerCase().contains(testStr.toLowerCase());
    return {
        hasString: retValue
    };
});

HTL Code:

<div data-sly-use.path="${'filepath.js' @ value='demo-page'}">
    ${path.hasString}
</div>

I have converted both strings to lower case for case insensitive check.