Hi,
Can anyone help me to find regular expression for the following in Perl?
"The string can only contain lower case letters (a-z) and no more than one of any letter."
For example: "table" is accepted, whether "dude" is not.
I have coded like this:
$str = "table";
if ($str =~ m/\b()\b/) {... (4 Replies)
Hi
I need to do this thing in awk (or perl?). I try to find out how can I identify 1st and 2nd result from the OR expression in gensub:
block='title Sata Mandriva
kernel /boot/vmlinuz
initrd /boot/initrd.img'
echo "$block" | awk '{ x=gensub(/(kernel|initrd) /,"\\1XXX","g"); print x }'
... (12 Replies)
I am having trouble parsing rpm filenames in a shell script.. I found a snippet of perl code that will perform the task but I really don't have time to rewrite the entire script in perl. I cannot for the life of me convert this code into something sed-friendly:
if ($rpm =~ /(*)-(*)-(*)\.(.*)/)... (1 Reply)
Hi,
I get the following when I cat a file *.log
xxxxx
=====
dasdas gwdgsg fdsagfsag agsdfag
=====
random data
=====
My output should look like :
If the random data after the 2nd ==== is null then OK should be printed else
the random data should be printed.
How do I go about this... (5 Replies)
Hi Guys
I have the following regex
$OSRELEASE = $1 if ($output =~ /(Mac OS X (Server )?10.\d)/);
output is currently
Mac OS X 10.7.5
when the introduction of Mac 10.8 output changes to
OS X 10.8.2
they have dropped the Mac bit so i changed the regex to be (2 Replies)
Hello,
I'm trying to get a quick help on regex since i'm not a regular programmer.
Below is the line i'm trying to apply my regex to..i want to use the regex in a for loop and this line will keep on changing.
subject=... (4 Replies)
Could anyone please make me understand how the ?= works below ..
After executing this I am getting the same output.
$string="I love chocolate.";
$string =~ s/chocolate(?= ice)/vanilla/;
print "$string\n"; (2 Replies)
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)
Experts -
I found a script on one of the servers that I work on and I need help understanding
one of the lines.
I know what the script does, but I'm having a hard time understanding the grouping.
Can someone help me with this?
Here's the script...
#!/usr/bin/perl
use strict;
use... (2 Replies)
Discussion started by: timj123
2 Replies
LEARN ABOUT DEBIAN
numgrep
NUMGREP(1) User Contributed Perl Documentation NUMGREP(1)NAME
numgrep - This program is the numeric equivilent of the grep utility.
SYNOPSIS
numgrep [-dhlV] <FILE>
| numgrep [-dhlV] (Input on STDIN from pipeline.)
numgrep [-dhlV] (Input on STDIN. Use Ctrl-D to stop.)
DESCRIPTION
numgrep searches for different occurances of numbers through the use of numeric expressions.
OPTIONS -l Print the matching numbers out one per line
instead of printing the entire line they are on.
-h Help: You're looking at it.
-V Increase verbosity.
-d Debug mode. For developers
EXPRESSIONS
numgrep uses a special numeric expression matching system. Basically, it searches for ranges, factors and sequences of numbers. Here is a
list of the syntax characters and some sample expressions that will get you going:
/<expression>/
Put your expression or set of expressions between these
two forward slashes.
.. Range expression. A number must be used on the left
and/or right of this expression to specify that numbers
between, greater than or less than the numbers specified
should be matched.
, Expression sepeartor. The comma sepearates one complete
expression from another in a set enclosed by //.
m<n> Multiples of <n>. This operator, followed by a number
<n> will match any number <x> that is an integer
multiple of <n>. Meaning that <x> = <n> times <y>,
where <y> is any integer.
f<n> Factors of <n>. This operator, followed by a number <n>
will match any number <x> that is an integer factor of
<n>. Meaning that <x> = <n> divided by <y>, where <y>
is any integer.
NOTE: Checking for factors and multiples is very fast because it
is checked by doing a single modulus operation on two numbers.
Examples:
/2..10/ Match any number between 2 and 10.
/2..10,20..30/ Match any number between 2 and 10 or between 20 and 30.
/56,34,512,45,67/ Match any of the numbers 56, 34, 512, 45 or 67.
/m3/ Match any integer that is a multiple of 3.
/f1024/ Match any integer that is a factor of 1024.
$ numrange -N /1..1000/ | numgrep /f1024/
1
2
4
8
16
32
64
128
256
512
$
BUGS
numgrep can't handle certain situations properly. Such as if it encounters a number with leading zeros, it will treat it as an octal
number and thus might not match the way you would expect.
numgrep does not yet allow you to mix numbers and text in the matching expression. So you can not do something like 'numgrep
/port=0..1023/ firewall.log'. But this will be changed in the future.
SEE ALSO numaverage(1), numbound(1), numinterval(1), numnormalize(1), numprocess(1), numsum(1), numrandom(1), numrange(1), numround(1)COPYRIGHT
numgrep is part of the num-utils package, which is copyrighted by Suso Banderas and released under the GPL license. Please read the
COPYING and LICENSE files that came with the num-utils package
Developers can read the GOALS file and contact me about providing
submitions or help for the project.
BUGS
numgrep will round decimal numbers with more than 15 digits of accuracy. This is
mostly due to limit's in the way programming languages deal directly with numbers.
MORE INFO
More info on numgrep can be found at:
http://suso.suso.org/programs/num-utils/
perl v5.10.1 2009-10-31 NUMGREP(1)