Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

non alpha characters in sed + making it fast?

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting non alpha characters in sed + making it fast?
# 8  
Old 10-05-2010
@ scrutinizer,

could you please explain this part?
Quote:
sed 's/\(^\|[^[:alnum:]]\)\(rich\|RICH\|Rich\)\([^[:alnum:]]\|$\)
especially ,
Quote:
^\|[^[:alnum:]]\
thanks in advance.
# 9  
Old 10-05-2010
Quote:
Originally Posted by rich@ardz
I won't even pretend i understand how this sed works! but it does! is it possible to replace uppercase with uppercase and lower with lower or would i have to run 2 different seds... cheers
Yes, AFAIK you would have to use one sed with multiple substitute statements.

Quote:
Originally Posted by dragon.1431
could you please explain this part?


especially ,
Hi, it means if rich, RICH or Rich is between non-alphanumerical characters [^[:alnum:]] or only on one side and on the other side it is at the beginning(^) or at the end ($) then replace it with "NICK" .
# 10  
Old 10-05-2010
hi scrutinizer, just to clarify Smilie are you saying this:

Code:
sed 's/\(^\|[^[:alnum:]]\)\(rich\|RICH\|Rich\)\([^[:alnum:]]\|$\)/\1NICK\3/g' infile

will replace 'rich' with 'nick' or 'RICH' with 'NICK'?

when I run it, it always replaces with 'NICK' no matter what version of 'RICH' i pass into it? or is this intended design?

much appreciated Smilie
# 11  
Old 10-05-2010
Hi, no I meant something like this:
Code:
sed -e 's/\(^\|[^[:alnum:]]\)rich\([^[:alnum:]]\|$\)/\1nick\2/g' \
    -e 's/\(^\|[^[:alnum:]]\)RICH\([^[:alnum:]]\|$\)/\1NICK\2/g' infile

or
Code:
sed 's/\(^\|[^[:alnum:]]\)rich\([^[:alnum:]]\|$\)/\1nick\2/g
     s/\(^\|[^[:alnum:]]\)RICH\([^[:alnum:]]\|$\)/\1NICK\2/g' infile

Last edited by Scrutinizer; 10-05-2010 at 07:54 AM..
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Outputting characters after a given string and reporting the characters in the row below --sed

I have this fastq file: @M04961:22:000000000-B5VGJ:1:1101:9280:7106 1:N:0:86 GGGGGGGGGGGGCATGAAAACATACAAACCGTCTTTCCAGAAATTGTTCCAAGTATCGGCAACAGCTTTATCAATACCATGAAAAATATCAACCACACCA +test-1 GGGGGGGGGGGGGGGGGCCGGGGGFF,EDFFGEDFG,@DGGCGGEGGG7DCGGGF68CGFFFGGGG@CGDGFFDFEFEFF:30CGAFFDFEFF8CAF;;8... (10 Replies)
Discussion started by: Xterra
10 Replies

2. Shell Programming and Scripting

awk to print column number while ignoring alpha characters

I have the following script that will print column 4 ("25") when column 1 contains "123". However, I need to ignore the alpha characters that are contained in the input file. If I were to ignore the characters my output would be column 3. What is the best way to print my column of interest... (3 Replies)
Discussion started by: ncwxpanther
3 Replies

3. Shell Programming and Scripting

Find/replace alpha characters in string

Hi, I would like to find a 3-letter character series in a string/variable and replace it with x's. An example set of strings is: 563MS333_101_afp_400-100_screening 563MS333_104-525_rjk_525_screening 563MS333_110_dlj_500-100_w24 563MS333_888-100_mmm_424_screening The only constants... (5 Replies)
Discussion started by: goodbenito
5 Replies

4. Shell Programming and Scripting

How does this sed expression to remove non-alpha characters work?

Hello! I know that this expression gets rid of non-alphanumeric characters: sed 's///g' and I understand that it is replacing them with nothing - hence the '//'-, but I don't understand how it's doing it. It seems it's finding strings that begin with alphanumeric and replacing them with... (2 Replies)
Discussion started by: bgnersoon2be#1
2 Replies

5. Shell Programming and Scripting

sed replacing specific characters and control characters by escaping

sed -e "s// /g" old.txt > new.txt While I do know some control characters need to be escaped, can normal characters also be escaped and still work the same way? Basically I do not know all control characters that have a special meaning, for example, ?, ., % have a meaning and have to be escaped... (11 Replies)
Discussion started by: ijustneeda
11 Replies

6. Shell Programming and Scripting

Sed or trim to remove non alphanumeric and alpha characters?

Hi All, I am new to Unix and trying to run some scripting on a linux box. I am trying to remove the non alphanumeric characters and alpha characters from the following line. <measResults>883250 869.898 86432.4 809875.22 804609 60023 59715 </measResults> Desired output is: 883250... (6 Replies)
Discussion started by: jackma
6 Replies

7. Shell Programming and Scripting

Making Some Characters in file BOLD

Hi All, I want to make some characters to be bold in a file. I have a file e.g aa.log which contains rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr gfgfgdaerqrqwrqerqwrwqwrqrqwrqr qqwerqwrqwrqwrqwrqwrqwrqwrq qwrqwrqwrqwrqwrqwrqwrqwrqwr File is too large to view Last line... (2 Replies)
Discussion started by: rajeshorpu
2 Replies

8. Shell Programming and Scripting

Perl: How do I remove leading non alpha characters

Hi, Sorry for silly question, but I'm trying to write a perl script to operate a log file that is in following format: (4)ab=1234/(10)bc=abcdef9876/cd=0.... The number in the brackets is the lenghts of the field, "/" is the field separator. Brackets are not leading every field. What I'm... (9 Replies)
Discussion started by: Juha
9 Replies

9. Shell Programming and Scripting

how to set a variable to accept alpha-numeric characters?

I am working on a shell program that needs to accept alpha-numeric input (i.e., P00375); when I use a simple 'read' statement to read in the input (i.e., read LOG), I receive the message "p00375: bad number". How must I adjust my input statement to accept alpha-numerics? Thanks! Brent (3 Replies)
Discussion started by: bcaunt
3 Replies
Login or Register to Ask a Question