Advanced Regular Expressions
The syntax added by advanced regular expressions is mostly just short hand notation for constructs you can make with the basic syntax already described. There are also some new features that add additional power: nongreedy quantifiers, back references, look-ahead patterns, and named character classes. If you are just starting out with regular expressions, you can ignore most of this section, except for the one about backslash sequences. Once you master the basics, of if you are already familar with regular expressions in Tcl (or the UNIX vi editor or grep utility), then you may be interested in the new features of advanced regular expressions.
Compatibility with Patterns in Tcl 8.0
Advanced regular expressions add ...
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