06-09-2008
Calling a substring from another file
I have two files:
One is a list of numbers:
1
5
6
7
10
The second is a very long string
abcdefghijklmno......1234567890
I'd like to print a new file with a 5 character substring that starts at each the positions listed in the 1st file:
such as:
abcde
efghi
fghij
ghijk
jklmno
I've attempted a few While and If loops but can't seem to get the syntax correct.
Thank you.
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LEARN ABOUT CENTOS
pcre16_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);
int pcre16_get_substring(PCRE_SPTR16 subject, int *ovector,
int stringcount, int stringnumber,
PCRE_SPTR16 *stringptr);
int pcre32_get_substring(PCRE_SPTR32 subject, int *ovector,
int stringcount, int stringnumber,
PCRE_SPTR32 *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[16|32]_exec() used
stringcount Value returned by pcre[16|32]_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[16|32]_malloc(). The convenience function pcre[16|32]_free_sub-
string() 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.
PCRE 8.30 24 June 2012 PCRE_GET_SUBSTRING(3)