Consider the following groups of text: abcd //match abcdefgh //match Xyzabcd //match Xyzabcdefgh //match 123abcdxy //match abcdabcd//1 match Abxcd //no match It defines any text combination that reads exactly abcd. They are very powerful queries that are particularly useful for finding a pattern of characters within any given group of texts. At a basic level, regular expressions can be considered search terms or queries. Regular expressions (commonly abbreviated to Regex or RegExp) are a sequence of characters that predefine a pattern for text combinations. Use regular expressions to boost your code.Perform input validation with regular expressions.Read and write basic regular expressions.In this article, we will take a quick dive into regular expressions, what they are, what they do and how they can help us create custom HTML input validations.Īt the end of this article, you will know how to: To the untrained eye, it probably looks like a lot of gibberish, but these seemingly random sequences of characters are the key to text querying algorithms used across multiple programming and query languages.
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