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Diffstat (limited to 'src/libregexp/regexp9.3')
| -rw-r--r-- | src/libregexp/regexp9.3 | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/src/libregexp/regexp9.3 b/src/libregexp/regexp9.3 deleted file mode 100644 index f2603562..00000000 --- a/src/libregexp/regexp9.3 +++ /dev/null @@ -1,227 +0,0 @@ -.TH REGEXP9 3 -.de EX -.nf -.ft B -.. -.de EE -.fi -.ft R -.. -.de LR -.if t .BR \\$1 \\$2 -.if n .RB ` \\$1 '\\$2 -.. -.de L -.nh -.if t .B \\$1 -.if n .RB ` \\$1 ' -.. -.SH NAME -regcomp, regcomplit, regcompnl, regexec, regsub, regerror \- Plan 9 regular expression library -.SH SYNOPSIS -.B #include <regexp9.h> -.PP -.ta \w'\fLRegprog 'u -.B -Reprog *regcomp(char *exp) -.PP -.B -Reprog *regcomplit(char *exp) -.PP -.B -Reprog *regcompnl(char *exp) -.PP -.nf -.B -int regexec(Reprog *prog, char *string, Resub *match, int msize) -.PP -.nf -.B -void regsub(char *source, char *dest, int dlen, Resub *match, int msize) -.PP -.nf -.B -int rregexec(Reprog *prog, Rune *string, Resub *match, int msize) -.PP -.nf -.B -void rregsub(Rune *source, Rune *dest, int dlen, Resub *match, int msize) -.PP -.B -void regerror(char *msg) -.SH DESCRIPTION -.I Regcomp -compiles a -regular expression and returns -a pointer to the generated description. -The space is allocated by -.IR malloc (3) -and may be released by -.IR free . -Regular expressions are exactly as in -.IR regexp9 (7). -.PP -.I Regcomplit -is like -.I regcomp -except that all characters are treated literally. -.I Regcompnl -is like -.I regcomp -except that the -.B . -metacharacter matches all characters, including newlines. -.PP -.I Regexec -matches a null-terminated -.I string -against the compiled regular expression in -.IR prog . -If it matches, -.I regexec -returns -.B 1 -and fills in the array -.I match -with character pointers to the substrings of -.I string -that correspond to the -parenthesized subexpressions of -.IR exp : -.BI match[ i ].sp -points to the beginning and -.BI match[ i ].ep -points just beyond -the end of the -.IR i th -substring. -(Subexpression -.I i -begins at the -.IR i th -left parenthesis, counting from 1.) -Pointers in -.B match[0] -pick out the substring that corresponds to -the whole regular expression. -Unused elements of -.I match -are filled with zeros. -Matches involving -.LR * , -.LR + , -and -.L ? -are extended as far as possible. -The number of array elements in -.I match -is given by -.IR msize . -The structure of elements of -.I match -is: -.IP -.EX -typedef struct { - union { - char *sp; - Rune *rsp; - } s; - union { - char *ep; - Rune *rep; - } e; -} Resub; -.EE -.LP -If -.B match[0].s.sp -is nonzero on entry, -.I regexec -starts matching at that point within -.IR string . -If -.B match[0].e.ep -is nonzero on entry, -the last character matched is the one -preceding that point. -.PP -.I Regsub -places in -.I dest -a substitution instance of -.I source -in the context of the last -.I regexec -performed using -.IR match . -Each instance of -.BI \e n\f1, -where -.I n -is a digit, is replaced by the -string delimited by -.BI match[ n ].s.sp -and -.BI match[ n ].e.ep\f1. -Each instance of -.L & -is replaced by the string delimited by -.B match[0].s.sp -and -.BR match[0].e.ep . -The substitution will always be null terminated and -trimmed to fit into dlen bytes. -.PP -.IR Regerror , -called whenever an error is detected in -.IR regcomp , -writes the string -.I msg -on the standard error file and exits. -.I Regerror -can be replaced to perform -special error processing. -If the user supplied -.I regerror -returns rather than exits, -.I regcomp -will return 0. -.PP -.I Rregexec -and -.I rregsub -are variants of -.I regexec -and -.I regsub -that use strings of -.B Runes -instead of strings of -.BR chars . -With these routines, the -.I rsp -and -.I rep -fields of the -.I match -array elements should be used. -.SH "SEE ALSO" -.IR grep (1), -.IR regexp9 (7) -.SH DIAGNOSTICS -.I Regcomp -returns -.B 0 -for an illegal expression -or other failure. -.I Regexec -returns 0 -if -.I string -is not matched. -.SH HISTORY -This particular regular expression was first written by Rob Pike for Plan 9. -It has also appeared as part of the Inferno operating system. -.SH BUGS -There is no way to specify or match a NUL character; NULs terminate patterns and strings. |