10-26-2007
What does the regular expression ['(^[^~]+~).*'] mean?
What does the regular expression ['(^[^~]+~).*'] mean while using it with regexec.When the string "RCHNUSNT35C~rs07/ASM-RS07" is used with the regular expression ['(^[^~]+~).*'] regexec gives an error. I know what regexec does,but i do not understand what this expression means wrt to this string...
any help would be appreciated
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REGEXP(2) System Calls Manual REGEXP(2)
NAME
regcomp, regcomplit, regcompnl, regexec, regsub, rregexec, rregsub, regerror - regular expression
SYNOPSIS
#include <u.h>
#include <libc.h>
#include <regexp.h>
Reprog *regcomp(char *exp)
Reprog *regcomplit(char *exp)
Reprog *regcompnl(char *exp)
int regexec(Reprog *prog, char *string, Resub *match, int msize)
void regsub(char *source, char *dest, Resub *match, int msize)
int rregexec(Reprog *prog, Rune *string, Resub *match, int msize)
void rregsub(Rune *source, Rune *dest, Resub *match, int msize)
void regerror(char *msg)
DESCRIPTION
Regcomp compiles a regular expression and returns a pointer to the generated description. The space is allocated by malloc(2) and may be
released by free. Regular expressions are exactly as in regexp(6).
Regcomplit is like regcomp except that all characters are treated literally. Regcompnl is like regcomp except that the . metacharacter
matches all characters, including newlines.
Regexec matches a null-terminated string against the compiled regular expression in prog. If it matches, regexec returns 1 and fills in
the array match with character pointers to the substrings of string that correspond to the parenthesized subexpressions of exp: match[i].sp
points to the beginning and match[i].ep points just beyond the end of the ith substring. (Subexpression i begins at the ith left parenthe-
sis, counting from 1.) Pointers in match[0] pick out the substring that corresponds to the whole regular expression. Unused elements of
match are filled with zeros. Matches involving and are extended as far as possible. The number of array elements in match is given by
msize. The structure of elements of match is:
typedef struct {
union {
char *sp;
Rune *rsp;
};
union {
char *ep;
Rune *rep;
};
} Resub;
If match[0].sp is nonzero on entry, regexec starts matching at that point within string. If match[0].ep is nonzero on entry, the last
character matched is the one preceding that point.
Regsub places in dest a substitution instance of source in the context of the last regexec performed using match. Each instance of
,
where n is a digit, is replaced by the string delimited by match[n].sp and match[n].ep. Each instance of is replaced by the string delim-
ited by match[0].sp and match[0].ep.
Regerror, called whenever an error is detected in regcomp, regexec, or regsub, writes the string msg on the standard error file and exits.
Regerror can be replaced to perform special error processing.
Rregexec and rregsub are variants of regexec and regsub that use strings of Runes instead of strings of chars. With these routines, the
rsp and rep fields of the match array elements should be used.
SOURCE
/sys/src/libregexp
SEE ALSO
grep(1)
DIAGNOSTICS
Regcomp returns 0 for an illegal expression or other failure. Regexec returns 0 if string is not matched.
BUGS
There is no way to specify or match a NUL character; NULs terminate patterns and strings.
REGEXP(2)