This free online tool allows you to quickly replace words or characters in a string, and also supports regular expression matching. To use regular expressions, simply click on the Regex button and enter your expression. Please note that this tool is case-insensitive, which means that if you type the word "Book", it will replace all occurrences of "Book" and "book" with the destination word.
A regular expression (regex or regexp) is a sequence of characters that defines a search pattern. It can be used to find or replace text, or to extract information from text.
Regular expressions are used in many different programming languages, including Python, Java, and JavaScript. They are also used in text editors and other software applications.
