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Top Forums Shell Programming and Scripting Fastest alternatives to flattening a non-uniform nested array with regex? Post 303015272 by f77hack on Saturday 31st of March 2018 05:37:10 PM
Old 03-31-2018
Quote:
Originally Posted by jim mcnamara
My opinion:

As a general solution that seems fine. I have not validated it. Are you encountering performance problems?

You could write a simple single purpose C program....
Thanks for the comments.

Yes, I tried some long, really off-the-wall, random arrays that would be equivalent to a messy json structure and the simple regex easily beat the recursion.

Good idea about C code, what do you think about the performance gain and memory utilization of using a threaded version? versus openmp/mpi? or versus GPU, if the incoming array is a continuous stream from a web socket? or similar.

For single precision, Int16 or UInt16, it seems like GPU would crush this problem but I'm unsure of the overhead required for the memory allocation.

Last edited by f77hack; 03-31-2018 at 06:52 PM.. Reason: add memory stuff
 

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RE_COMP(3)						     Linux Programmer's Manual							RE_COMP(3)

NAME
re_comp, re_exec - BSD regex functions SYNOPSIS
#define _REGEX_RE_COMP #include <sys/types.h> #include <regex.h> char *re_comp(char *regex); int re_exec(char *string); DESCRIPTION
re_comp() is used to compile the null-terminated regular expression pointed to by regex. The compiled pattern occupies a static area, the pattern buffer, which is overwritten by subsequent use of re_comp(). If regex is NULL, no operation is performed and the pattern buffer's contents are not altered. re_exec() is used to assess whether the null-terminated string pointed to by string matches the previously compiled regex. RETURN VALUE
re_comp() returns NULL on successful compilation of regex otherwise it returns a pointer to an appropriate error message. re_exec() returns 1 for a successful match, zero for failure. CONFORMING TO
4.3BSD. NOTES
These functions are obsolete; the functions documented in regcomp(3) should be used instead. SEE ALSO
regcomp(3), regex(7), GNU regex manual COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
1995-07-14 RE_COMP(3)
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