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Top Forums UNIX for Dummies Questions & Answers Grep words with X doubles only Post 302825369 by sudon't on Monday 24th of June 2013 09:09:24 AM
Old 06-24-2013
Quote:
Originally Posted by alister
To find words that have at least one double but not more than 3:
Code:
sed -n -e '/\(.\)\1/!d; s//&/4; t' -e p

The number can be parameterized with a shell variable.

Regards,
Alister
Hey Alister!
I don't really know sed very well, but let me see if I can figure this out. I think it's worth pointing out that I have no background with this stuff. I'm just learning on my own, in my spare time, such as it is.
In the first regex, it looks like you're finding any instance of doubles, then saying do not delete, presumably so the pattern gets passed to the second regex?
In the second regex, it looks like you're saying substitute "nothing" with the found pattern. I'm guessing the "4" is a quantifier? And the "t'"? I have no idea.
I feel I have a vague notion of what you're doing, but can't entirely parse the two regexes. But, here we are with two (three?) regexes again. Is it really not possible to do this in a single grep ERE, or PCRE?
 

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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 3.27 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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