Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Regular expression in AWK

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Regular expression in AWK
# 1  
Old 05-07-2009
Regular expression in AWK
Hello world,

I was wondering if there is a nicer way to write the following code (in AWK):

Code:
 
awk '
FNR==NR&&$1~/^m[24689]$/{tok1=1}
FNR==NR&&$1~/^m10$/{tok1=1}
' my_file

In fact, it looks for m2, m4, m6, m8 and m10 and then return a positive flag. The problem is how to define 10 thanks to regular expresions?
Is there a way do a list of possible values, like "{2,4,6,8,10}"?

Let me know,

Thanks
# 2  
Old 05-07-2009
how 'bout;
Code:
awk '
FNR==NR { tok1=($1 ~ "^m([24689]|10)$" ? 1 : 0}
' my_file

# 3  
Old 05-07-2009
Thanks, that is what I was looking for!


Quote:
Originally Posted by vgersh99
how 'bout;
Code:
awk '
FNR==NR { tok1=($1 ~ "^m([24689]|10)$" ? 1 : 0}
' my_file

# 4  
Old 05-08-2009
Quote:
Originally Posted by vgersh99
how 'bout;
Code:
awk '
FNR==NR { tok1=($1 ~ "^m([24689]|10)$" ? 1 : 0}
' my_file

There's a missing close parenthesis after the last zero and NR==FNR is unnecessary if you have 1 input file, this should be sufficient:

Code:
awk '{tok1=/^m([24689]|10)$/?1:0}' file

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

awk regular expression search

Hi All, I would like to search a regular expression by passing as an i/p variableto AWK. For Example :: 162.111.101.209.9516 162.111.101.209.41891 162.111.101.209.9516 162.111.101.209.9517 162.111.101.209.41918 162.111.101.209.9517 162.111.101.209.41937 162.111.101.209.41951... (7 Replies)
Discussion started by: Girish19
7 Replies

2. Shell Programming and Scripting

Problem with Regular expression in awk

Hi, I have a file with two fields in it as shown below 14,30 28,30 16,30 22,30 21,30 3,30 Fields are separated by comma ",". I've been trying to validate the file based on the condition "each field must be a numeric value" I am using HP-UX OS. I have tried the following awk... (4 Replies)
Discussion started by: meetsriharsha
4 Replies

3. Shell Programming and Scripting

awk regular expression

Hello, I have big files which I wanna filter them based on first column. first column should be one of these strings: chr2L || chr2R || chr3L || chr3R || chr4 || chrX and something like chr2Lh or chrY or chrM3L is not accepted. I used the following command: awk '{ if ($1=="chr2L" ||... (5 Replies)
Discussion started by: @man
5 Replies

4. Programming

Perl: How to read from a file, do regular expression and then replace the found regular expression

Hi all, How am I read a file, find the match regular expression and overwrite to the same files. open DESTINATION_FILE, "<tmptravl.dat" or die "tmptravl.dat"; open NEW_DESTINATION_FILE, ">new_tmptravl.dat" or die "new_tmptravl.dat"; while (<DESTINATION_FILE>) { # print... (1 Reply)
Discussion started by: jessy83
1 Replies

5. UNIX for Advanced & Expert Users

Regular Expression Error in AWK

I have a file "fwcsales_filenames.txt" which has a list of file names that are supposed to be copied to another directory. In addition to that, I am trying to extract the date part and write to the log. I am getting the regular expression error when trying to strip the date part using the "ll"... (1 Reply)
Discussion started by: madhunk
1 Replies

6. Shell Programming and Scripting

Regular expression query in AWK

Hi, I have a string like this-->"After Executing service For 10 Request" in this string i need to extract "10". the contents of the string is variable and "10" appears before "For" and after "Request" i.e, in this format "For x Request" I need to extract the value of x. How to do this in AWK?... (10 Replies)
Discussion started by: omprasad
10 Replies

7. Shell Programming and Scripting

need help guys for Regular expression in awk

Hello Experts, Please help me to cope with the following problem I ve patterens like Input Noptx(5) // remain the same -*Nop(3); Nop(9); --Nop(8); // remain the same d3 **---Nop(7); //remain the same d3 **---Nop(7); *--Nop(6); --**Nop(5); -Nop(4); Nop(3); - represents a space... (2 Replies)
Discussion started by: user_prady
2 Replies

8. UNIX for Dummies Questions & Answers

regular expression and awk

I can print a line with an expression using this: awk '/regex/' I can print the line immediately before an expression using this: awk '/regex/{print x};{x=$0}' How do I print the line immediately before and then the line with the expression? (2 Replies)
Discussion started by: nickg
2 Replies

9. Shell Programming and Scripting

awk and regular expression

Ive got a file with words and also numbers. Bla BLA 10 10 11 29 12 89 13 35 And i need to change "10,29,89,25" and also remove anything that contains actually words... (4 Replies)
Discussion started by: maskot
4 Replies

10. Shell Programming and Scripting

Regular expression query in AWK

I have a varable(var1) in a AWK script that contain data in the following format - I need to extract timestamp,priority and log message.I can extract these by using split function but i don't want to use it, since i want to extract it in one go. I have some difficulties in doing it using... (3 Replies)
Discussion started by: omprasad
3 Replies
Login or Register to Ask a Question