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    Command:

    regerror

    
    
    

    SYNOPSIS

           #include <sys/types.h>
           #include <regex.h>
    
           int regcomp(regex_t *preg, const char *regex, int cflags);
    
           int regexec(const regex_t *preg, const char *string, size_t nmatch,
                       regmatch_t pmatch[], int eflags);
    
           size_t regerror(int errcode, const regex_t *preg, char *errbuf,
                           size_t errbuf_size);
    
           void regfree(regex_t *preg);
    
    
    

    DESCRIPTION

       POSIX regex compiling
           regcomp()  is  used to compile a regular expression into a form that is
           suitable for subsequent regexec() searches.
    
           regcomp() is supplied with preg, a pointer to a pattern buffer  storage
           area;  regex, a pointer to the null-terminated string and cflags, flags
           used to determine the type of compilation.
    
           All regular expression searching must be done via  a  compiled  pattern
           buffer,  thus  regexec()  must always be supplied with the address of a
           regcomp() initialized pattern buffer.
    
           cflags may be the bitwise-or of one or more of the following:
    
           REG_EXTENDED
                  Use POSIX Extended Regular Expression syntax  when  interpreting
                  regex.   If  not  set,  POSIX Basic Regular Expression syntax is
                  used.
    
           REG_ICASE
                  Do not differentiate case.  Subsequent regexec() searches  using
                  this pattern buffer will be case insensitive.
    
           REG_NOSUB
                  Do  not report position of matches.  The nmatch and pmatch argu-
                  ments to regexec() are ignored if the  pattern  buffer  supplied
                  was compiled with this flag set.
    
           REG_NEWLINE
                  Match-any-character operators don't match a newline.
    
                  A  nonmatching  list ([^...])  not containing a newline does not
                  match a newline.
    
                  Match-beginning-of-line operator (^) matches  the  empty  string
                  immediately  after  a newline, regardless of whether eflags, the
                  execution flags of regexec(), contains REG_NOTBOL.
                  see  the  compilation flag REG_NEWLINE above).  This flag may be
                  used when different portions of a string are passed to regexec()
                  and the beginning of the string should not be interpreted as the
                  beginning of the line.
    
           REG_NOTEOL
                  The match-end-of-line operator always fails to  match  (but  see
                  the compilation flag REG_NEWLINE above).
    
       Byte offsets
           Unless  REG_NOSUB was set for the compilation of the pattern buffer, it
           is possible to obtain match addressing  information.   pmatch  must  be
           dimensioned  to  have at least nmatch elements.  These are filled in by
           regexec() with substring match addresses.  The offsets  of  the  subex-
           pression  starting at the ith open parenthesis are stored in pmatch[i].
           The  entire  regular  expression's  match  addresses  are   stored   in
           pmatch[0].   (Note  that  to  return  the  offsets  of  N subexpression
           matches, nmatch must be at least N+1.)  Any unused  structure  elements
           will contain the value -1.
    
           The  regmatch_t  structure  which  is  the type of pmatch is defined in
           <regex.h>.
    
               typedef struct {
                   regoff_t rm_so;
                   regoff_t rm_eo;
               } regmatch_t;
    
           Each rm_so element that is not -1 indicates the  start  offset  of  the
           next  largest  substring  match  within the string.  The relative rm_eo
           element indicates the end offset of the match, which is the  offset  of
           the first character after the matching text.
    
       POSIX error reporting
           regerror() is used to turn the error codes that can be returned by both
           regcomp() and regexec() into error message strings.
    
           regerror() is passed the error code, errcode, the pattern buffer, preg,
           a  pointer  to  a  character string buffer, errbuf, and the size of the
           string buffer, errbuf_size.  It returns the size of the errbuf required
           to  contain  the  null-terminated error message string.  If both errbuf
           and errbuf_size are  nonzero,  errbuf  is  filled  in  with  the  first
           errbuf_size  - 1 characters of the error message and a terminating null
           byte ('\0').
    
       POSIX pattern buffer freeing
           Supplying regfree() with a precompiled pattern buffer, preg  will  free
           the  memory  allocated  to the pattern buffer by the compiling process,
           regcomp().
    
    
    

    RETURN VALUE

           regcomp() returns zero for a successful compilation or  an  error  code
           REG_BADRPT
                  Invalid use of repetition operators such as  using  '*'  as  the
                  first character.
    
           REG_EBRACE
                  Un-matched brace interval operators.
    
           REG_EBRACK
                  Un-matched bracket list operators.
    
           REG_ECOLLATE
                  Invalid collating element.
    
           REG_ECTYPE
                  Unknown character class name.
    
           REG_EEND
                  Nonspecific error.  This is not defined by POSIX.2.
    
           REG_EESCAPE
                  Trailing backslash.
    
           REG_EPAREN
                  Un-matched parenthesis group operators.
    
           REG_ERANGE
                  Invalid use of the range operator; for example, the ending point
                  of the range occurs prior to the starting point.
    
           REG_ESIZE
                  Compiled regular expression requires  a  pattern  buffer  larger
                  than 64Kb.  This is not defined by POSIX.2.
    
           REG_ESPACE
                  The regex routines ran out of memory.
    
           REG_ESUBREG
                  Invalid back reference to a subexpression.
    
    
    

    CONFORMING TO

           POSIX.1-2001.
    
    
    

    SEE ALSO

           grep(1), regex(7)
           The glibc manual section, Regular Expression Matching
    
    
    

    GNU 2013-02-11 REGEX(3)

    
    
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