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A regular expression pattern is a template that matches a set of text strings.
A regular expression is a string comprised of normal or literal characters and special meta-characters. The normal characters match themselves, while the special characters define repetition, character classes, backreferences to prior matching fragments, etc…
While a complete discussion of regular expressions is beyond the scope of these Help Pages, an in depth reference of EASA's regular expression pattern language, is found in the Java documentation below: