03-02-2012
Please post the exact perl one-liner you used.
From the error message, I can only guess that you used something like this: /([1-9]?{0,10}tomatoes[1-9]?{0,10}/.
What did you want to achieve? Why would you give '?' and then define intervals too?
? and {0,10} are both quantifiers.
? refers to zero or one match of the previous character.
{0,10} refers to zero to 10 matches of previous character.
? is a quantifier and so is {0,10}. In your regex, ? is followed by {0,10}, and hence the error message 'Nested quantifiers in 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(const char *regex);
int re_exec(const 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.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
+---------------------+---------------+-----------+
|Interface | Attribute | Value |
+---------------------+---------------+-----------+
|re_comp(), re_exec() | Thread safety | MT-Unsafe |
+---------------------+---------------+-----------+
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 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
GNU
2017-09-15 RE_COMP(3)