diff options
| -rw-r--r-- | man3/regex.3 | 53 |
1 files changed, 25 insertions, 28 deletions
diff --git a/man3/regex.3 b/man3/regex.3 index 30f2ef318..8efd21d72 100644 --- a/man3/regex.3 +++ b/man3/regex.3 @@ -179,37 +179,34 @@ This flag is a BSD extension, not present in POSIX. .SS Match offsets Unless .B REG_NOSUB -was set for the compilation of the pattern buffer, it is possible to -obtain match addressing information. -.I pmatch -must be dimensioned to have at least -.I nmatch -elements. -These are filled in by +was passed to +.BR regcomp (), +it is possible to +obtain the locations of matches within +.IR string : .BR regexec () -with substring match addresses. -The offsets of the subexpression starting at the -.IR i th -open parenthesis are stored in -.IR pmatch[i] . -The entire regular expression's match addresses are stored in -.IR pmatch[0] . -(Note that to return the offsets of -.I N -subexpression matches, +fills .I nmatch -must be at least -.IR N+1 .) -Any unused structure elements will contain the value \-1. +elements of +.I pmatch +with results: +.I pmatch[0] +corresponds to the entire match, +.I pmatch[1] +to the first subexpression, etc. +If there were more matches than +.IR nmatch , +they are discarded; +if fewer, +unused elements of +.I pmatch +are filled with +.BR \-1 s. .PP -Each -.I rm_so -element that is not \-1 indicates the start offset of the next largest -substring match within the string. -The relative -.I rm_eo -element indicates the end offset of the match, -which is the offset of the first character after the matching text. +Each returned valid +.RB (non- \-1 ) +match corresponds to the range +.RI [ "string + rm_so" , " string + rm_eo" ). .PP .I regoff_t is a signed integer type |