The [string match] and [glob] commands test whether strings match a "pattern", with "`*`" and "`?`" as notable wildcard characters.

Arguably, a [regular expression] (as matched by [regexp]) is also a pattern, though a much more complex one.
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In the context of general programming, "pattern" often means "Design Pattern"
(as in ''Design Patterns'' by Gamma, Helm, Johnson, and Vlissides).

**See**
   * [Design patterns in Tcl]
   * [Incr Tcl Design Patterns]
   * [The iterator design pattern]
   * [The observer design pattern]
   * [Prototype Pattern in Tcl]
   * [Snit design patterns]
   * [Visitor Pattern]

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