![]() We also saw how they can be used for searching simple as well as complex search patterns. In this article, we learned how important regular expressions are. For example ^ represents the start of a line, $ represents end of a line, and \b represents word boundaries. There are also position meta-characters which represent a position. There are plenty of other uses for quantifiers. Var str = "This is a string with multiple whitespaces" var newStr = str.replace(/\s\s /g, " ") console.log(newStr) //prints "This is a string with multiple whitespaces" We could also use quantifiers to replace multiple whitespaces with a single whitespace. \w matches one or more occurrences of an alpha-numeric character, that is, every word in a string. You could replace some long validation logic like this:įunction IsValidEmail(email) can be used to match a number of occurrences in a range or a given number of times nĪn example would be the one we used above to reverse every word in a string. Regex can also be used to validate certain types of patterns, like validating Email. You could search any type of string that follows a pattern, for example URLs or text between parentheses. *.Īnd that's not all regex can do – emails are just an example. Most modern text editors allow Regex in their Find option. You could do that manually, but there is a super fast method that can do it for you. You won't understand the real importance of Regular expressions until you are given a long document and are told to extract all emails from it. Javascript regex match how to#In this article we will learn how to use this amazing tool in JavaScript. String-searching algorithms are also a significant branch of computer science. Regex (for short) are a very powerful tool to help you find simple as well as complex search patterns. Regular expressions exist in JavaScript and most other programming languages. These patterns are known as Regular Expressions. It can not only replace plain strings, but patterns too. But most of us don't know that this tool is even more powerful than we realize. If you have been using find and replace for a while, you might know how useful this feature is. And like most tools, all text editors have one feature in common: find and replace. Developers have been using text editors for a long time. ![]()
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