Substring using cut/awk/sed Post: 302464382

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Top Forums Shell Programming and Scripting Substring using cut/awk/sed Post 302464382 by Scrutinizer on Wednesday 20th of October 2010 02:59:33 AM

10-20-2010

Moderator

Quote:

Originally Posted by sumoka

sorry for the late response .

Please ignore the first two o/p s .

1. In the 3rd o/p , even though I have selected first two matching occurrances it is selecting 3 characters

2. If I reduce one more dot for second string it selects 4 character for 1st field & equal number of characters get clipped from the filename in o/p.

can you explain how this happens ?

Thanks ,
sumoka.

In the third example this is because the first character is not part of the search and replace operation (and likewise aren't the last 10 characters). Look what happens when we do this:

Code:

$ echo MPMTR20100706043000.txt|sed -n -e 's/\(..\)\(..\)\([0-9]\{8\}\)//p'
M043000.txt

Code:

$ echo MPMTR20100706043000.txt|sed -n -e 's/\(..\)\(..\)\([0-9]\{8\}\).*//p'
M

Code:

$ echo MPMTR20100706043000.txt|sed -n -e 's/.\(..\)\(..\)\([0-9]\{8\}\).*//p'

Code:

$ echo MPMTR20100706043000.txt|sed -n -e 's/.\(..\)\(..\)\([0-9]\{8\}\).*/\1,\2,\3,&/p'
PM,TR,20100706,MPMTR20100706043000.txt

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LEARN ABOUT PHP

mb_strcut

MB_STRCUT(3)								 1							      MB_STRCUT(3)

mb_strcut - Get part of string

SYNOPSIS

       string mb_strcut (string  $str, int  $start, [int  $length = NULL], [string  $encoding = mb_internal_encoding()])

DESCRIPTION

       mb_strcut(3) extracts a substring from a string similarly to mb_substr(3), but operates on bytes instead of characters. If the cut position
       happens to be between two bytes of a multi-byte character, the cut is performed starting from the first byte of	that  character.  This	is
       also  the  difference  to  the  substr(3) function, which would simply cut the string between the bytes and thus result in a malformed byte
       sequence.

PARAMETERS

	      o $str
		- The string being cut.

	      o $start
		- Starting position in bytes.

	      o $length
		- Length in bytes. If omitted or NULL is passed, extract all bytes to the end of the string.

	      o $encoding
		-The $encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used.

RETURN VALUES

       mb_strcut(3) returns the portion of $str specified by the $start and $length parameters.

SEE ALSO

       mb_substr(3), mb_internal_encoding(3).

PHP Documentation Group 													      MB_STRCUT(3)

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