07-27-2009
case-insensitive if on substring
I'd like to print a line if a substring is matched in a case insensitive manner
something like do a case insensitive search for ABCD as a substring:
awk '{ if (substr($1,1,4) == "[Aa][Bb][Cc][Dd]") print $1 }' infile > outfile
I'm not certain how to make the syntax work???
Thanks
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1.grep -nc text filename
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3.grep -i filename text
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LEARN ABOUT OPENSOLARIS
pcre_get_substring
PCRE_GET_SUBSTRING(3) Library Functions Manual PCRE_GET_SUBSTRING(3)
NAME
PCRE - Perl-compatible regular expressions
SYNOPSIS
#include <pcre.h>
int pcre_get_substring(const char *subject, int *ovector,
int stringcount, int stringnumber,
const char **stringptr);
DESCRIPTION
This is a convenience function for extracting a captured substring. The arguments are:
subject Subject that has been successfully matched
ovector Offset vector that pcre_exec() used
stringcount Value returned by pcre_exec()
stringnumber Number of the required substring
stringptr Where to put the string pointer
The memory in which the substring is placed is obtained by calling pcre_malloc(). The convenience function pcre_free_substring() can be
used to free it when it is no longer needed. The yield of the function is the length of the substring, PCRE_ERROR_NOMEMORY if sufficient
memory could not be obtained, or PCRE_ERROR_NOSUBSTRING if the string number is invalid.
There is a complete description of the PCRE native API in the pcreapi page and a description of the POSIX API in the pcreposix page.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Availability | SUNWpcre |
+--------------------+-----------------+
|Interface Stability | Uncommitted |
+--------------------+-----------------+
NOTES
Source for PCRE is available on http://opensolaris.org.
PCRE_GET_SUBSTRING(3)