• The Regex class alows you to manipulate regular expressions. Regular expression can be illustrated by few examples: (A)* - any string containing A's, as A, AA, AAA, ... [AB]* - any string containing A and B's, as A, B, AA, AB, BA, BB, ... (AB)* - any string containing AB's, as AB, ABAB, ABABAB, ... A[AB]?B - A, AAB, ABB and so on It can be used, for example, in parsers: if the variable name is defined in programming language as any string starting with a letter or underscore followed by a sequence of letters, digits and underscores, you may write [_a-zA-Z][_a-zA-Z0-9]* Regex class allows to specify a regular expression and search for its ocuurences in a given string

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