(This page has never contained anything, please use the [Regular Expressions] page instead - [LV])

(But note that [Regular Expressions] will take you to a place where Tcl's [ARE] are discussed, and there are other [RE] flavors around - [Luciano ES])

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Okay then - feel free to add information here on the other RE flavors
available in Tcl...

[LES] says that there no other RE flavors available in Tcl. Tcl only uses [ARE]. What I meant is that Regular Expressions may be construed as any one (or all) of its several variations, but [Regular Expressions] only discusses Tcl's [ARE]. I said that because this wiki discusses many things under several contexts, not necessarily that of Tcl, and I thought it would be good to note that, at least in this case, '''it is''' restricted to the context of Tcl. Anyone interested in a different or more ample discussion of Regular Expressions will have to look elsewhere. E.g. on [PCRE].

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[RS]: Well, the Wiki doesn't claim to have all info - it rather asks those in the know to contribute it :) Here's from man re_syntax:

"DIFFERENT FLAVORS OF REs

Regular expressions (``RE''s), as defined by POSIX, come in two flavors: extended REs (``EREs'') and basic REs (``BREs''). EREs are roughly those of the traditional egrep, while BREs are roughly those of the traditional ed. This implementation adds a third flavor, advanced REs (``AREs''), basically EREs with some significant extensions.

This manual page primarily describes AREs. BREs mostly exist for backward compatibility in some old programs; they will be discussed at the end. POSIX EREs are almost an exact subset of AREs. Features of AREs that are not present in EREs will be indicated."

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[Category Glossary]