For a programming exercise, I am mean to design a Perl script that detects double letters in a text file.
I tried the following expressions
Im aware that the + means to search for one or more occurences of that character, however trying both of these did not meet the requirements of my program.
Also
did not prove to be helpful as well
After doing some searching, I stumbled across the correct form of the regex for the double letter case. It turned out to be
Now I know that . refers to any single character and the \1 refers to the first character in the line being read (if s/..../.... is being used), but Im still puzzled as to why /(.)\1/ works instead of /[a-zA-Z]+/ for the case of double letters ?
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)
I have got numbers like
l255677
l376039
l188144
l340482
l440700
l254113
to match the numbers starting with '13' what would be the regex
=~/13(.*)/ =======>This is not working ....
But for user123,user657
regex =~/user(.*)/ ========>works
Thanks for help..!! (7 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,
I'm new to perl and need simple regex for reading a file using my perl script.
The text file reads as -
filename=/pot/uio/current/myremificates.txt
certificates=/pot/uio/current/userdir/conf/user/gamma/settings/security/... (3 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 HPUX
isalpha
ctype(3C)ctype(3C)NAME
ctype: isalnum(), isalpha(), isascii(), isblank(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isupper(),
isxdigit() - classify characters according to type
SYNOPSIS DESCRIPTION
These functions classify character-coded integer values according to the rules of the coded character set identified by the last successful
call to (see setlocale(3C)). Each function is a predicate returning nonzero for true, zero for false.
If has not been called successfully, characters are classified according to the rules of the default ASCII 7-bit coded character set (see
setlocale(3C)).
is defined on all integer values; the other functions are defined for the range (EOF) through
RETURN VALUE
The functions return nonzero under the following circumstances; zero otherwise:
c is an alphanumeric (letters or digits).
c is a letter.
c is any ASCII character code between 0 and 0177, inclusive.
c is a blank character; that is, a space or a tab.
c is a control character (in ASCII: character codes less than 040 and the delete character(0177)).
c is a decimal digit (in ASCII: characters [0-9]).
c is a visible character (in ASCII: printing characters, excluding the space character(040)).
c is a lowercase letter.
c is a printing character.
c is a punctuation character (in ASCII: any printing character except the space character(040), digits, letters).
c is a character that creates whitespace in displayed text (in ASCII: space, tab, carriage return, newline, verti-
cal tab, and formfeed).
c is an uppercase letter.
c is a hexadecimal digit (in ASCII: characters [0-9], [A-F] or [a-f]).
If the argument to any of these functions is outside the domain of the function, the result is undefined.
EXTERNAL INFLUENCES
Environment Variables
The category determines the classification of character type.
International Code Set Support
Single-byte character code sets are supported.
WARNINGS
These functions are supplied both as library functions and as macros defined in the header. Normally, the macro versions are used. To
obtain the library function, either use a to remove the macro definition or, if compiling in ANSI-C mode, enclose the function name in
parenthesis or take its address. The following example uses the library functions for and
AUTHOR
was developed by IBM, OSF, and HP.
SEE ALSO setlocale(3C), ascii(5), thread_safety(5).
STANDARDS CONFORMANCE ctype(3C)