Searching a list

As with any data contained within a program, it is the ability to locate and use that data that makes the program usable. To accomplish this, Tcl provides not only a command, but also a full complement of option flags to tailor the search. The lsearch command allows us to search a list to determine if it contains a particular element. Before we explore the syntax, we will first need to understand the options. The options are as follows:

Type of option	Option name	Interpretation
Matching style options	-exact	The pattern is a literal string that is compared against each element.
	-glob	The pattern is a glob-style pattern that is matched against each element in the same manner, as a string match.
	-regexp	The pattern is treated as a regular expression and matched against each element.
	-sorted	The list elements are sorted in order. If specified, lsearch will use a more efficient search algorithm. The list is assumed to be sorted in ascending order and...