A regular expression is a programming construct for matching strings of text. Implemented by many programming languages and frameworks, regular expressions (also known as regexes or regexps) are useful because of their combination of brevity and expressivity. Read more...See also: PHP
Root documents can be used to pass variables from one VoiceXML page to another VoiceXML page. Root documents are specified per VoiceXML script and are themselves a VoiceXML script. Read more...See also: Leaf Document