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Course Content


In java, a regular expression is a pattern that can be used to match and find specific information in strings. It is also called a “regex”. The most common use of regular expressions is to search for text in files or text-based data.

The three basic types of regular expressions are:

  • Basic regular expression
  • Extended regular expression
  • Context-free regular expression

Regular expressions are very helpful when you have to do something with strings that is not straightforward. For example, if you need to extract all the vowels from a string and then sort them alphabetically, you would use regular expressions.

Regular expressions are a pattern matching tool used in programming languages. They allow us to search and replace text within a string.

Regular expressions use a syntax similar to other languages but they also have their own unique features. The most important feature is that they can be nested inside each other. This means that you can create patterns using multiple regular expressions and then find the parts of the string that match those patterns.

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