The Java Regex or Regular Expression is an API to define a pattern for searching or manipulating strings. It is widely used to define the constraint on strings such as password and email validation.

The topic of regular expressions is rich and complex, and Java's implementation of it is comprehensive. A thorough study of the package would be a significant undertaking, and we have only presented ...

The backslash is an escape character in Java. For example \n denotes the new line character. Hence to use a backslash in the context of a regular expression you will have to use two backslashes, the ...

Because “^” has significance in regular expressions (start of line), it doesn’t work too well as demonstrated in the next screen snapshot. The “^” character is not the only token ...