November 1999
Intermediate to advanced
832 pages
19h 28m
English
Content preview from Practical Programming in Tcl & Tk, Third EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Regular Expression Syntax
This section describes the basics of regular expression patterns, which are found in all versions of Tcl. There are occasional references to features added by advanced regular expressions, but they are covered in more detail starting on page 138. There is enough syntax in regular expressions that there are five tables that summarize all the options. These tables appear together starting at page 145.
A regular expression is a sequence of the following items:
A literal character.
A matching character, character set, or character class.
A repetition quantifier.
An alternation clause.
A subpattern grouped with parentheses.
Matching Characters
Most characters simply match themselves. The following pattern matches an a followed ...
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