mod_pcreposix

A portable Fortran module for the Perl compatible regular expressions (in Unix).

Notes for "pcreposix":

• PCRE: Perl-Compatible Regular Expressions
• POSIX: Portable Operating System Interface, where X may stand for Unix (??? :D)

1) Requires. Make sure that the libs of pcre and pcreposix (i.e. libpcre.a and libpcreposix.a) were installed in our system. For instance, in Debian 8 (Jessie), we can install it quickly using the apt-get command:

• sudo apt-get install libpcre3 libpcre3-dev

and we should have

• /usr/include/pcreposix.h
• /usr/lib/x86_64-linux-gnu/libpcreposix.a

Further ref. for Debian,

https://manpages.debian.org/jessie/libpcre3-dev/index.html

https://manpages.debian.org/jessie/libpcre3-dev/pcreposix.3.en.html

and for Centos,

https://centos.pkgs.org/7/centos-x86_64/pcre-8.32-17.el7.x86_64.rpm.html

2) Provides. Files:

• dep_pcreposix.c: C code wrapping the pcreposix functions
• mod_pcreposix.f90: Fortran module binding with the C code
• t_pcreposix_01.f90: A testing program. To compile, read its head or the make.sh. To know how to run, type the command ./t_pcreposix_01.exe without arguments.
• t_pcreposix_gen.sh: A Bash script to perform 30 test cases which are copied from

https://github.com/niklongstone/regular-expression-cheat-sheet

https://github.com/ZedThree/fortran_pcre

and some other cases from

https://www.regular-expressions.info/examples.html

The fortran_pcre package is excelent but this mod_pcreposix goes without the iso_c_binding module. It's just simple.

• make.sh: a Bash script. All (compiling, linking, running tests) will run after this command ./make.sh

3) Compiles.

• gcc -O3 -Wall -c dep_pcreposix.c
• gfortran -O3 -Wall -c mod_pcreposix.f90
• gfortran -O3 -Wall t_pcreposix_01.f90 *.o -lpcreposix -o t_pcreposix_01.exe

4) Tests. Run all the tests (30+ cases, or you can add more by yourself) by the command

• ./t_pcreposix_gen.sh ./t_pcreposix_01.exe

Make sure all the Bash scripts had the executable permission, or add it using the command

• chmod +x *.sh

5) Run all. To run all after this command

• ./make.sh

---

USAGE:

 1. call pcre_regcomp ( preg, pattern, istat ) 
 2. call pcre_regexec ( preg, str, pmatch, nmatch, nfound ) 
 3. call pcre_regfree ( preg ) 

where

 preg     integer(kind=8)
 pattern  character(len=*)
 istat    integer(kind=4)
 str      character(len=*)
 pmatch   integer(kind=4), dimension(2,nmatch)
 nmatch   integer(kind=4)
 nfound   integer(kind=4)

The package was well tested in Debian 9 (4.9.0-12-amd64) with gcc version 6.3.0.

Report on any bug of this code at [email protected].

---

UPDATE:

• exe_param.c: C code generating parameters for mod_pcreposix.f90 in-situ.

• make.sh has been changed. At the very first time, run

  ./make.sh  config 
  

to revise mod_pcreposix.f90 accordingly to your local system, because the C code exe_param.c will be compiled so as it can generate values of the parameters within the region marked by

  !@@@@@BeginParam
  ...
  !@@@@@EndParam

in the Fortran file. Just do it only one time. In addition, run

  ./make.sh  clean 

to clean out.