Table of Contents

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  1. Preface
  2. Introduction to Dynamic Data Masking
  3. Rules
  4. Connection Rules
  5. Security Rules
  6. Security Rule Set Simulator
  7. Masking Functions
  8. Stored Procedure Result Set Masking
  9. Integration with Informatica Products
  10. Appendix A: XML Functions Reference
  11. Appendix B: Glossary

Capturing Groups

Capturing Groups

A capturing group is a method that you can use to group multiple characters inside a set of parenthesis. Count the opening parentheses from left to right to enumerate the capturing group.
In the expression ((A)(B(C))), there are four groups: ((A)(B(C))), (A), (B(C)), and (C). Group zero stands represents the whole expression.
The captured characters in a group are the most recent sub-sequence that the group matched. All captured input is discarded at the beginning of each match. If a group is matched again, the previously captured value is retained if the second evaluation fails. For example, the matching the string "aba" in the expression
(a(b)?)+
changes group two set to
(B)
.
Groups that start with the expression
(?
do not capture text and do not count toward the group total.