libPasPCRE2 is delphi and object pascal bindings for Perl-compatible Regular Expressions library (PCRE2). Library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5.
Library is tested for
- Embarcadero (R) Delphi 10.3 on Windows 7 Service Pack 1 (Version 6.1, Build 7601, 64-bit Edition)
- FreePascal Compiler (3.2.0) and Lazarus IDE (2.0.10) on Ubuntu Linux 5.8.0-33-generic x86_64
Get the sources and add the source directory to the project search path. For FPC add the source directory to the fpc.cfg file.
Clone the repository git clone https://github.com/isemenkov/libpaspcre2.
Add the unit you want to use to the uses clause.
A testing framework consists of the following ingredients:
- Test runner project located in
unit-testsdirectory. - Test cases (DUnit for Delphi and FPCUnit for FPC based) for all containers classes.
libpaspcre2.pas file contains the PCRE2 translated headers to use this library in pascal programs. You can find C API documentation at www.pcre.org website.
uses
libpaspcre2, utils.api.cstring;
var
re : pcre2_code_8;
rc : Integer;
pattern, subject : PCRE2_SPTR8;
error_buffer : string[255];
subject_length : Int64;
error_number : Integer;
error_offset : PCRE2_SIZE;
ovector : PPCRE2_SIZE;
match_data : ppcre2_match_data_8;
substring : string;
begin
pattern := PCRE2_SPTR8(API.CString.Create('(?:\D|^)(5[1-5][0-9]{2}(?:\ |\-|)[0-9]{4}'+
'(?:\ |\-|)[0-9]{4}(?:\ |\-|)[0-9]{4})(?:\D|$)').ToPAnsiChar);
subject := PCRE2_SPTR8(API.CString.Create('5111 2222 3333 4444').ToPAnsiChar);
subject_length := API.CString.Create('5111 2222 3333 4444').Length;
re := pcre2_compile_8(pattern, PCRE2_ZERO_TERMINATED, 0, @error_number, @error_offset, nil);
if re = nil then
begin
pcre2_get_error_message_8(error_number, PPCRE2_UCHAR8(@error_buffer[0]), 256);
Fail(Format('PCRE2 compilation failed at offset %d: %s', [error_offset, error_buffer]));
end;
match_data := pcre2_match_data_create_from_pattern_8(re, nil);
rc := pcre2_match_8(re, subject, subject_length, 0, 0, match_data, nil);
if rc < 0 then
begin
case rc of
PCRE2_ERROR_NOMATCH :
begin
pcre2_match_data_free_8(match_data);
pcre2_code_free_8(re);
Fail('No match');
end;
end;
end;
{
ovector := pcre2_get_ovector_pointer_8(match_data);
if ovector^ > (ovector + 1)^ then
Fail('Error');
substring := Copy(PChar(subject), ovector^, (ovector + 1)^ - ovector^);
pcre2_match_data_free_8(match_data);
pcre2_code_free_8(re);
}
end;