![]() Stephen Cole Kleene, who introduced the concept Regular expressions are supported in many programming languages. Regular expressions are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical analysis. Different syntaxes for writing regular expressions have existed since the 1980s, one being the POSIX standard and another, widely used, being the Perl syntax. They came into common use with Unix text-processing utilities. ![]() ![]() The concept of regular expressions began in the 1950s, when the American mathematician Stephen Cole Kleene formalized the concept of a regular language. Regular expression techniques are developed in theoretical computer science and formal language theory. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation. This becomes even more important when you have a large test suite.Blue highlights show the match results of the regular expression pattern /h+/g (the letter h followed by one or more vowels)Ī regular expression (shortened as regex or regexp sometimes referred to as rational expression ) is a sequence of characters that specifies a match pattern in text. A test that isn't executed, is always faster than a test that is executed. While we previously have seen that running tests in parallel is also a good way to improve your pipeline, using these techniques make your pipeline(s) more efficient. In Playwright we can use tags to organize our tests into logical sets, and with the grep and grep-invert flags we can target specific test set(s) to run. ![]() We looked into the grep functionality in combination with test tags to help you scale your test suite. You could fallback to the configuration file when needed, with the following syntaxt Conclusion I haven't found a way to create an OR by using the command line. To take a look at how grep works, let's create a few test cases and see what happens while using grep. You can also define multiple scripts in your package.json file with the various grep expressions. Personally, I prefer to use the grep property via the command line, as it's easier to modify. Or you can also use the -grep-invert option or the grepInvert property to exclude tests that match the pattern. To define the grep pattern, you can use the -grep (or -g) flag via the command line or the grep property in the configuration file. Well, Playwright allows you to use the grep functionality to run specific tests using the test description. So what does this have to do with Playwright? In other words, it's a tool that allows you to efficiently search for a text using a regex.
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