Tuesday, June 12, 2012

TCL - Simple pattern matching - "globbing"


By default, lsearch uses the "globbing" method of finding a match. Globbing is the wildcarding technique that most Unix shells use.
globbing wildcards are:
*
Matches any quantity of any character
?
Matches one occurrence of any character
\X
The backslash escapes a special character in globbing just the way it does in Tcl substitutions. Using the backslash lets you use glob to match a * or ?.
[...]
Matches one occurrence of any character within the brackets. A range of characters can be matched by using a range between the brackets. For example, [a-z] will match any lower case letter.
There is also a glob command that you will see in later sections that uses glob pattern matching in directories, and returns a list of the matching files.

Example

# Matches
string match f* foo
# Matches
h f?? foo # Doesn't
string mat c match string match f foo
s on my Debian system. set bins [glob /usr/bin/*]
# Returns a big list of fil
e

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