You said you wanted the 11? Why, then, is the second "wrong" wrong?
In your regex, you want 00 in positions 9 and 10. And, you may want to reread the regex documentation, as (man regex):
Quote:
A bracket expression is a list of characters enclosed in "[]". It normally matches any single character from the list
So your bracket expr. seems to have too large a list, including 0 and , . On top, you are deleting the matching lines, so reverse the effect. Try instead:
or, for better readability
hi,
i got a problem with understanding regular expressions. what i wanna do is
scanning the wtmp logfile for ips and if a specific ip is echoed id like to be a part of a text to be assigned to it.
the scanning is done with
#! /bin/bash
cat wtmp | strings | egrep -o "+\.+\.+\." | sort -u... (6 Replies)
I have a simple file test.out that contains data in the form of
key1=A|shift1
key2=B|shift2
key3=C|shift3
and so on.
I need to get it to print
A
B
C
I can do it using lookbehind assertion such as this
( ?<==)()
yet I was wondering if there is another way of mutching single... (8 Replies)
Hi
I have a question on regex
There is a line in a script like
my_file="$(echo SunMonTueWed | sed "s//_&g") "
My question what does the expression _&g do.
Obviously in this example the output is
_Sun_Mon_Tue_Wed
Another question can i use some trick to get the result like... (3 Replies)
Hi, im sure this is really simple but i cant quite figure it out. how do i test against a word at the beginning of the line but up to the point of a delimiter i.e. ":"
for example if i wanted to test against the user in the /etc/passwd file
peter:x:101:100:peters account:/var/peter:/bin/sh
... (3 Replies)
I have a basic question regarding * and . while using regex:
# echo 3 | grep ^*$
3
I think I understood why it outputs "3" here (because '*' matches zero or more of the previous character) but I don't understand the output of the following command:
# echo 3 | grep ^.$
#
I thought I... (7 Replies)
I have dates in mm/dd/yy format that I wish to convert to yy-mm-dd format.
()/()/() finds them, but when I try to replace with $3-$1-$2 both kate and kwrite treat it as a text literal. (2 Replies)
Hi,
I am trying to write a regex for myscript and need some input from experts.
here is what I must grep for
TICKET{Sapce}{Space}{hyphen}
so here is the example data
TICKET 34554, CT-12345, TICKET 12345: some text here
TICKET 2342, CT-12345, MA-12344: some text here
TICKET... (5 Replies)
Hi guys,
I have a file in the following format:
cmpr5551
cmpr6002
cmpr93
anne 5454
bbro 434
cmprsvc
cmprsvc7
ffgi55
vefe99
cmprsvc8
cmprsvc9
I need to "grep" only the entries which start with "cmpr" followed by the number. All other entries should be excluded.
I was trying to use... (3 Replies)
Hi guys,
I am trying to "grep" or "egrep" the following entry out of the file using regex:
MACCDB1 or MACCDB2
The problem is that the file might contain other entries which start with "MACCDB" string.
I was trying to use regex to "grep" the exact pattern but it fails to output the correct... (2 Replies)
Hi I am trying to match lines having following string
BIND dn="uid=
putting something like this is not working :
/\sBIND dn="uid=/
Any suggestion.
Thanks. John (9 Replies)
Discussion started by: john_prince
9 Replies
LEARN ABOUT OSF1
regcmp
regcmp(3) Library Functions Manual regcmp(3)NAME
regcmp, regex - Compile and execute regular expression
LIBRARY
Standard C Library (libc.so, libc. a)
SYNOPSIS
#include <libgen.h>
char *regcmp( const char *string1, ... /*, (char *)0 */);
char *regex( const char *re, const char *subject, ... );
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
regcmp(), regex(): XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
PARAMETERS
Points to the string that is to be matched or converted. Points to a compiled regular expression string. Points to the string that is to
be matched against re.
DESCRIPTION
The regcmp() function compiles a regular expression consisting of the concatenated arguments and returns a pointer to the compiled form.
The end of arguments is indicated by a null pointer. The malloc() function is used to create space for the compiled form. It is the
responsibility of the process to free unneeded space so allocated. A null pointer returned from regcmp() indicates an invalid argument.
The regex() function executes a compiled pattern against the subject string. Additional arguments of type char must be passed to receive
matched subexpressions back. A global character pointer, __loc1, points to the first matched character in the subject string.
The regcmp() and regex() functions support the simple regular expressions which are defined in the grep(1) reference page, but the syntax
and semantics are slightly different. The following are the valid symbols and their associated meanings: The left and right bracket,
asterisk, period, and circumflex symbols retain their meanings as defined in the grep(1) reference page. A dollar sign matches the end of
the string;
matches a new line. Used within brackets, the hyphen signifies an ASCII character range. For example [a-z] is equivalent
to [abcd...xyz]. The - (hyphen) can represent itself only if used as the first or last character. For example, the character class
expression []-] matches the characters ] (right bracket) and - (hyphen). A regular expression followed by a + (plus sign) means one or
more times. For example, [0-9]+ is equivalent to [0-9][0-9]*. Integer values enclosed in {} braces indicate the number of times the pre-
ceding regular expression can be applied. The value m is the minimum number and u is a number, less than 256, which is the maximum. The
syntax {m} indicates the exact number of times the regular expression can be applied. The syntax {m,} is analogous to {m,infinity}. The +
(plus sign) and * (asterisk) operations are equivalent to {1,} and {0,}, respectively. The value of the enclosed regular expression is
returned. The value is stored in the (n+1)th argument following the subject argument. A maximum of ten enclosed regular expressions are
allowed. The regex() function makes its assignments unconditionally. Parentheses are used for grouping. An operator, such as *, +, or
{}, can work on a single character or a regular expression enclosed in parentheses. For example, (a*(cb+)*)$0.
Since all of the symbols defined above are special characters, they must be escaped to be used as themselves.
NOTES
The regcmp() and regex() interfaces are scheduled to be withdrawn from a future version of the X/Open CAE Specification.
These interfaces are obsolete; they are guaranteed to function properly only in the C/POSIX locale and so should be avoided. Use the POSIX
regcomp() interface instead of regcmp() and regex().
RETURN VALUES
Upon successful completion, the regcmp() function returns a pointer to the compiled regular expression. Otherwise, a null pointer is
returned and errno may be set to indicate the error.
Upon successful completion, the regex() function returns a pointer to the next unmatched character in the subject string. Otherwise, a
null pointer is returned.
RELATED INFORMATION
Commands: grep(1)
Functions: malloc(3), regcomp(3)
Standards: standards(5) delim off
regcmp(3)