Regexp represents a regular expression.
|pattern||regular expression pattern||Yes|
<regexp id="myregexp" pattern="alpha(.+)beta"/>
Defines a regular expression for later use with id myregexp.
Use the regular expression with id myregexp.
Apache Ant comes with wrappers for the java.util.regex package, jakarta-regexp and jakarta-ORO, See installation dependencies concerning the supporting libraries.
ant.regexp.regexpimpl governs which regular expression implementation will be chosen.
Possible values for this property are :
ant.regexp.regexpimplis not defined, Ant uses Jdk14Regexp as this is always available.
There are cross-platform issues for matches related to line terminator. For example if you use $ to anchor your regular expression on the end of a line the results might be very different depending on both your platform and the regular expression library you use. It is 'highly recommended' that you test your pattern on both Unix and Windows platforms before you rely on it.
These string filters also use the mechanism of regexp to choose a regular expression implementation :