Regular expressions are a text-matching tool that provides a means for searching for strings of text of interest, such as particular characters, words, or patterns of characters. They are powerful, but can be complex. As entire books are devoted to them, complete coverage is beyond the scope of this user guide.
LeadConduit uses regular expressions in Pattern-Based Validation and when Parsing Delivery Responses.
For more information, refer to the Regular-Expressions.info. The site is an extensive reference, and includes a tutorial as well as links to more resources. Note that LeadConduit is a Java application, and uses Java's built-in regular expression support.
You can also use this Regular Expression Test Page to test your regular expressions.