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Top Forums Shell Programming and Scripting Perl:string substitution Pattern: ='abc...', Post 302279082 by KevinADC on Thursday 22nd of January 2009 12:58:35 AM
Old 01-22-2009
Quote:
Originally Posted by Niroj
o/p=> c1: c2: c3:
Smilie Thanks Kelvin ! But could plz explain How does it work for c3='hg5 sh'.
(c3='.....' does not end with a comma "," !!)?
In the regexp you see ,?. In this context the ? symbol is a quantifier that means zero or one of whatever is to the left of it. So it will match zero or one comma.

Quote:
Originally Posted by Niroj
And my 2nd query is why "$str =~ s/='.*',?/:/g;" gives o/p as "c:" , though it should stop at c2='...', bcoz c3='..' doesn't end with a comma..
In your regexp you have used .* which means to match zero or more of anything as much as possible. This is called greedy matching. So it matches whatever is between the first single quote and the last single quote in the string. What you should have done was used .*? which means to match zero or more of anything but as little as possible. This is called stingy matching. But using the negated character class [^'] is actually more efficient then using .*? to achieve the same result.
 

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COLORS(3)						   libbash colors Library Manual						 COLORS(3)

NAME
colors -- libbash library for setting tty colors. SYNOPSIS
colorSet <color> colorReset colorPrint [<indent>] <color> <text> colorPrintN [<indent>] <color> <text> DESCRIPTION
General colors is a collection of functions that make it very easy to put colored text on tty. The function list: colorSet Sets the color of the prints to the tty to COLOR colorReset Resets current tty color back to normal colorPrint Prints TEXT in the color COLOR indented by INDENT (without adding a newline) colorPrintN The same as colorPrint, but trailing newline is added Detailed interface description follows. Available colors: Green Red Yellow White The color parameter is non-case-sensitive (i.e. RED, red, ReD, and all the other forms are valid and are the same as Red). FUNCTIONS DESCRIPTIONS
colorSet <color> Sets the current printing color to color. colorReset Resets current tty color back to normal. colorPrint [<indent>] <color> Prints text using the color color indented by indent (without adding a newline). Parameters: <indent> The column to move to before start printing. This parameter is optional. If ommitted - start output from current cursor position. <color> The color to use. <color> The text to print. colorPrintN [<indent>] <color> The same as colorPrint, except a trailing newline is added. EXAMPLES
Printing a green 'Hello World' with a newline: Using colorSet: $ colorSet green $ echo 'Hello World' $ colorReset Using colorPrint: $ colorPrint 'Hello World'; echo Using colorPrintN: $ colorPrintN 'Hello World' AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <gil@ran4.net> SEE ALSO
ldbash(1), libbash(1) Linux Epoch Linux
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