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Full Discussion: Sed to replace second number in a random string
Top Forums UNIX for Dummies Questions & Answers Sed to replace second number in a random string Post 302383174 by Franklin52 on Monday 28th of December 2009 04:51:38 PM
Old 12-28-2009
Quote:
Originally Posted by glev2005
Franklin, it seems to mostly work, could you please explain it a little?
Explanation:
Code:
sed 's/\(.*STDM.\).\(.*\)/\16\2/'

With sed you can save substrings with \(.*\) and recall them back with \1, \2, \3 etc.

\(.*STDM.\).\(.*\)

The 1st portion \(.*STDM.\) is from the start of the line till the character after STDM (hence the dot)
The 2st portion .\(.*\) is from one character after the 1st portion (hence the dot before the substring) till the end of the line

\16\2

\1 -> print the 1st portion
6 -> print a "6"
\2 -> print the 2nd portion
 

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LEARN ABOUT PHP

mb_strrichr

MB_STRRICHR(3)								 1							    MB_STRRICHR(3)

mb_strrichr - Finds the last occurrence of a character in a string within another, case insensitive

SYNOPSIS

       string mb_strrichr (string  $haystack, string  $needle, [bool  $part = false], [string  $encoding = mb_internal_encoding()])

DESCRIPTION

       mb_strrichr(3) finds the last occurrence of $needle in $haystack and returns the portion of $haystack. Unlike mb_strrchr(3), mb_strrichr(3)
       is case-insensitive. If $needle is not found, it returns FALSE.

PARAMETERS

	      o $haystack
		- The string from which to get the last occurrence of $needle

	      o $needle
		- The string to find in $haystack

	      o $part
		- Determines which portion of $haystack this function returns. If set to TRUE, it returns all of $haystack from the  beginning	to
		the last occurrence of $needle. If set to FALSE, it returns all of $haystack from the last occurrence of $needle to the end,

	      o $encoding
		- Character encoding name to use. If it is omitted, internal character encoding is used.

RETURN VALUES

	Returns the portion of $haystack. or FALSE if $needle is not found.

SEE ALSO

       mb_stristr(3), mb_strrchr(3).

PHP Documentation Group 													    MB_STRRICHR(3)
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