Testomato allows you to create string checks for two types of page content. Those simple checks can be created for: 1. `HTML on page` - represents raw source code that we downloaded from given URL 2. `Text on page` - represents just readable text from given URL ![String checks](/img/checks/string-checks.png) Then you can use following **operators**: * `contains` - check that downloaded content contains given string with [substr()](https://www.php.net/manual/en/function.substr.php) PHP function * `does not contain` - check that content does not contain given string * `equals` - content is exactly same * `matches` - check that content match regular expression with [preg_match()](https://www.php.net/manual/en/function.preg-match.php) PHP function * `does not match` - check that content does not match :::tip **String checks** are case sensitive, so make sure you **PaY ClosE AtTentioN** to the text you enter. ::: ### How regular expressions are processed Testomato processes and escapes all users inputs including regular expressions. We are using `{` and `}` for wrapping your regex and also adding the following [Pattern Modifiers](https://www.php.net/manual/en/reference.pcre.pattern.modifiers.php): * `u` pattern and subject strings are treated as UTF-8. An invalid subject will cause the preg_* function to match nothing * `m` subject strings are treated as multi-line string You can debug your regex with https://www.phpliveregex.com/ or https://phphub.net/regex/ ### When to use `HTML on page` vs `Text on page`? `HTML on page` is content as downloaded from a given url, only encoded to `utf8` - it's useful for checking all content including HTML tags or meta information in ``. `Text on page` is a subset of `HTML on page` - we just remove all markup (HTML tags, head, scripts etc.) and then apply all your checks. :::note Need to check structure or counts instead of text — e.g. exactly one `

`, or every `` has `alt` text? See [XPath checks](/checks/xpath/). :::