05-28-2010
sed is matching the whole line and segragating the only string within the <college> and </college>. As you can see, that is enclosed with the operators \( and \). The string inside this operator is your target string which is "IIT Chennai". And \1 corresponds to this string. So in a nutshell, it is replacing the whole string in the line with only "IIT chennail" which you wanted. Hope this helps.
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textutil::tabify(n) Text and string utilities, macro processing textutil::tabify(n)
__________________________________________________________________________________________________________________________________________________
NAME
textutil::tabify - Procedures to (un)tabify strings
SYNOPSIS
package require Tcl 8.2
package require textutil::tabify ?0.7?
::textutil::tabify::tabify string ?num?
::textutil::tabify::tabify2 string ?num?
::textutil::tabify::untabify string ?num?
::textutil::tabify::untabify2 string ?num?
_________________________________________________________________
DESCRIPTION
The package textutil::tabify provides commands that convert between tabulation and ordinary whitespace in strings.
The complete set of procedures is described below.
::textutil::tabify::tabify string ?num?
Tabify the string by replacing any substring of num space chars by a tabulation and return the result as a new string. num defaults
to 8.
::textutil::tabify::tabify2 string ?num?
Similar to ::textutil::tabify this command tabifies the string and returns the result as a new string. A different algorithm is used
however. Instead of replacing any substring of num spaces this command works more like an editor. num defaults to 8.
Each line of the text in string is treated as if there are tabstops every num columns. Only sequences of space characters containing
more than one space character and found immediately before a tabstop are replaced with tabs.
::textutil::tabify::untabify string ?num?
Untabify the string by replacing any tabulation char by a substring of num space chars and return the result as a new string. num
defaults to 8.
::textutil::tabify::untabify2 string ?num?
Untabify the string by replacing any tabulation char by a substring of at most num space chars and return the result as a new
string. Unlike textutil::tabify::untabify each tab is not replaced by a fixed number of space characters. The command overlays each
line in the string with tabstops every num columns instead and replaces tabs with just enough space characters to reach the next
tabstop. This is the complement of the actions taken by ::textutil::tabify::tabify2. num defaults to 8.
There is one asymmetry though: A tab can be replaced with a single space, but not the other way around.
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category textutil
of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for
either package and/or documentation.
SEE ALSO
regexp(n), split(n), string(n)
KEYWORDS
formatting, string, tabstops
CATEGORY
Text processing
textutil 0.7 textutil::tabify(n)