Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

regex challenge

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting regex challenge
# 8  
Old 10-02-2008
Pure regular expressions only match a string; it doesn't get much purer than the sed solutions you already got.
# 9  
Old 10-02-2008
Here is an easy ( beautiful ? Smilie ) hack

Code:
sed 's/\./#/;s/\./_/g;s/#/\./' filename

# 10  
Old 10-02-2008
Quote:
Originally Posted by matrixmadhan
Here is an easy ( beautiful ? Smilie ) hack

Code:
sed 's/\./#/;s/\./_/g;s/#/\./' filename

Nice!
For multiple dots in the first part (before the opening brace):


Code:
$ perl -pe's/([^.]+)\.(?!.+{)/$1_/g'<<<'f.i.r.s.t.key ?{x.y.z}'
f.i.r.s.t.key ?{x_y_z}

Last edited by radoulov; 10-02-2008 at 06:48 AM.. Reason: sorry, wrong copy/pasting :)
# 11  
Old 10-02-2008
Or with a negative lookahead assertion,

Code:
perl -pe 's/\.(?!.*\?\{)/_/g'

# 12  
Old 10-02-2008
Quote:
Originally Posted by era
Or with a negative lookahead assertion,

Code:
perl -pe 's/\.(?!.*\?\{)/_/g'

Yes,
this is more succinct and efficient.
Last edited by radoulov; 10-02-2008 at 07:06 AM.. Reason: sorry, wrong copy/pasting :)
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Sendmail K command regex: adding exclusion/negative lookahead to regex -a@MATCH

I'm trying to get some exclusions into our sendmail regular expression for the K command. The following configuration & regex works: LOCAL_CONFIG # Kcheckaddress regex -a@MATCH +<@+?\.++?\.(us|info|to|br|bid|cn|ru) LOCAL_RULESETS SLocal_check_mail # check address against various regex... (0 Replies)
Discussion started by: RobbieTheK
0 Replies

2. Shell Programming and Scripting

Perl, RegEx - Help me to understand the regex!

I am not a big expert in regex and have just little understanding of that language. Could you help me to understand the regular Perl expression: ^(?!if\b|else\b|while\b|)(?:+?\s+){1,6}(+\s*)\(*\) *?(?:^*;?+){0,10}\{ ------ This is regex to select functions from a C/C++ source and defined in... (2 Replies)
Discussion started by: alex_5161
2 Replies

3. Shell Programming and Scripting

Anyone like a challenge?

I have searched through google, and this forum to try and find the answer, but alas, nothing quite hits the whole answer. I am trying to read the last line (or lines) of some log files. I do this often. The files are named sequentially, using the date as part of the file name, and appending... (18 Replies)
Discussion started by: BatterBits
18 Replies

4. UNIX for Dummies Questions & Answers

Touch Challenge

I've been given a directory full of subdirectories full of logfiles of the same name: /logfiles/day1/file1/blockednodes.csv day1-14 file1-48 The above is the actual directory structure for 14 days worth of a logfile that is generated every 30 minutes. It's been done this way to preserve the... (15 Replies)
Discussion started by: Cludgie
15 Replies

5. AIX

openssh connectivity challenge

Running a Power 5 Blade on AIX, with remote connectivity issues via putty. AIX V 6.1.00-02 openssh V5.2.0.5300 openssl V0.9.8.1103 Intermittent remote connections. Seems to connect every other time I try via my putty client. Using hosts.allow and hosts.deny to filter IP Addrss... (2 Replies)
Discussion started by: FrankM
2 Replies

6. Shell Programming and Scripting

PS1 challenge

Ok then i Have a challenge for you : Give me PS1 so that it always display the least 2 levels of directory (except if i am above of course) I want it this way : so if i go to / /home/ /home/user /home/user/whatever /home/user/whatever1/whatever2 my PS1 should respectively... (12 Replies)
Discussion started by: ctsgnb
12 Replies

7. Shell Programming and Scripting

Converting perl regex to sed regex

I am having trouble parsing rpm filenames in a shell script.. I found a snippet of perl code that will perform the task but I really don't have time to rewrite the entire script in perl. I cannot for the life of me convert this code into something sed-friendly: if ($rpm =~ /(*)-(*)-(*)\.(.*)/)... (1 Reply)
Discussion started by: suntzu
1 Replies

8. Shell Programming and Scripting

AWK Challenge

I have the following text Microsoft iSCSI Initiator version 2.0 Build 3497 Targets List: iqn.2001-05.com.equallogic:0-8a0906-daef43402-138000002a4477ba-grsrv12-extra iqn.2001-05.com.equallogic:0-8a0906-986f43402-520000002b447951-exchange ... (9 Replies)
Discussion started by: netmedic
9 Replies

9. UNIX for Advanced & Expert Users

safeword challenge

Hi, there are some servers here at work which issue a Safeword challenge after I login. Can anyone tell me exactly how the challenge/response system works? In particular, how are the valid keys decided? (2 Replies)
Discussion started by: blowtorch
2 Replies

10. UNIX for Advanced & Expert Users

X25 Address - A challenge...

Okay - I've been searching near and far for the answer to this seemly simple question..... how do I find the X25 address for a server. Is there some sort of dump or ping or even a config which would tell me the address. I can find nothing on the web and my colleagues can't help either. (1 Reply)
Discussion started by: peter.herlihy
1 Replies
Login or Register to Ask a Question