08-29-2011
The main part is to say - print one two three
Ok. The regex reflects the structure of you paragraphs - lines separated by empty lines (sed does some cleaning for it). -00 switch says to perl to read a file by paragraphs. The structure is:
some starting chars (not in the regex)
colon
:
spaces
\s*
shars
(.*) - remember them in $1
before newline
\n
chars
.*
before colon
:
spaces
\s*
remember digits in $2
(\d+)
chars, including newline (for that is /s in the end of the regex)
.*
before colon
:
spaces
\s*
digits to $3
(\d+)
some ending shars (not in the regex)
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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 3.25 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)