Digest for comp.lang.c++@googlegroups.com - 1 update in 1 topic

comp.lang.c++@googlegroups.com

Google Groups

Topic digest
View all topics

• [OT] Help for a RegEx - 1 Update

[OT] Help for a RegEx

wij <wyniijj5@gmail.com>: Aug 12 11:33PM -0700 On Thursday, August 3, 2023 at 1:39:17 AM UTC+8, Fonntuggnio wrote: > contain   > a long list of attributes, with or without zero or more \n > \r \t characters, valid, before the >.   The following is an example program of class Regex (class wrapper of regex(3) functions). The regular expression "<p>.*</p>" should do most of the job, except real HTML involves comments, nested tags, erroneous format...etc:   []a_grep "<p>.*</p>" *html   ------------------------------------------------- /* Copyright is licensed by GNU LGPL, see file COPYING. by I.J.Wang 2023   Simulate grep command (Extended regular expression, ERE)   Build: make a_grep */ #include <Wy.stdio.h> #include <Wy.unistd.h> #include <Wy.regex.h>   using namespace Wy;   constexpr const char Red[]="\x1B[31m"; constexpr const char Reset[]= "\x1B[0m";   void sim_grep(Regex& rexpr, const char* fname) { Errno r; String str; ::regmatch_t mbuf[5]; RegFile regf(fname,O_RDONLY); RdBuf strm(regf);   for(;strm.is_eof()==false;) { if((r=strm.read(str))!=Ok) { WY_THROW(r); } if((r=rexpr.regexec(str.c_str(),mbuf,WY_CARR_SIZE(mbuf),0))!=Ok) { continue; } cout << fname << ": "; cout << StrSeg(str.begin(), str.begin()+mbuf[0].rm_so); cout << Red << StrSeg(str.begin()+mbuf[0].rm_so, str.begin()+mbuf[0].rm_eo) << Reset; cout << StrSeg(str.begin()+mbuf[0].rm_eo, str.end()); } };   int main(int argc, const char* argv[]) try { static const char usage[]="a_grep <pattern> <file>+" WY_ENDL; Errno r;   if(argc<3) { cout << "Error: Invalid argument" WY_ENDL "Usage: " << usage << WY_ENDL; return -1; } const char* ptn= argv[1]; Regex rexpr;   if((r=rexpr.regcomp(ptn,REG_EXTENDED))!=Ok) { if(r!=EBADMSG) { WY_THROW(r); } String str; if((r=rexpr.regerror(str))!=Ok) { WY_THROW(r); } cout << str << WY_ENDL; return -1; }   for(int i=2; i<argc; ++i) { const char* fname= argv[i]; sim_grep(rexpr,fname); }   cout << "OK" WY_ENDL; return 0; } catch(const Errno& e) { cerr << wrd(e) << WY_ENDL; return -1; } catch(...) { cerr << "main() caught(...)" WY_ENDL; throw; };

Back to top

You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to comp.lang.c+++unsubscribe@googlegroups.com.