which version of java supports util.regex
I think Java version 1.4.2 and above supports the util.regex.
The classes present in util.regex package is used for for pattern matching using regular expressions. It helps the developers to create program that matches character sequences against regular expressions pattern specified by user.
An engine that performs match operations on a character sequence by interpreting a Pattern.
A compiled representation of a regular expression.
Please see example of util.regex at Finding start and end index of string using Regular expression.