Java Regex - Java tutorial - w3Schools - Chapter-48 English
A regular expression is a sequence of characters that forms a search pattern. When you search for data in a text, you can use this search pattern to describe what you are searching for.
A regular expression can be a single character, or a more complicated pattern.
Regular expressions can be used to perform all types of text search and text replace operations.
Java does not have a built-in Regular Expression class, but we can import the java.util.regex package to work with regular expressions.
Regular Expression Patterns
Quantifiers
Metacharacters
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