The subst transform Child Element

The <subst> element is a child of the <transform> step, and specifies a Perl5-based substitution pattern to apply as a transform. Multiple <subst> elements may appear as children of the <transform> elements, but they may not be used in conjunction with any other child elements. When more than one <subst> elements appear, they are applied sequentially.

All occurrences of the pattern in the input file are replaced, including multiple occurrences within a line.

The details of the supported syntax can be found in the Oro documentation (class org.apache.oro.text.regex.Perl5Substitution).