get RegExp[@@species] The constructor function that is used to create derived objects. Here is the regex you are looking for: const regex = /[A-Za-z_%]/g Explanation: /.../ - Javascript regex literal syntax [...] - A group of possible matches (exp. There is a proposal to add such a function to RegExp, but it was rejected by TC39. are deprecated, SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. But a simple \d\d:\d\d is too vague. So we can use it to search from a given position: let regexp = /love/gi; let str = "I love JavaScript"; // start the search from position 10: regexp.lastIndex = … Last modified: Jan 15, 2021, by MDN contributors. Javascript regex match. Regular expressions allow you to check a string of characters like an e-mail address or password for patterns, to see so if they match the pattern defined by that regular expression and produce actionable information. The ranges shown above are general; you could also use the range [0-3] to match any decimal digit ranging from 0 through 3, or the range [b-v] to match any lowercase character ranging from b through v. Trying to better understand how you would use regular expressions to to check for 1 Digit OR 1 Special Character. Use the constructor function when you know the regular expression pattern will be changing, or you don't know the pattern and are getting it from another source, such as user input. That’s the essential part of the task, otherwise it would be trivial. When the search for a match requires something more than a direct match, such as finding one or more b's, or finding white space, you can include special characters in the pattern. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. If the regular expression remains constant, using this can improve performance. Next, minutes must be from 00 to 59. Alternation is the term in regular expression that is actually a simple “OR”. In the regexp language: