Beyond Linux® From Scratch - Version svn-20070421

Chapter 8. General Libraries

PCRE-7.0

Introduction to PCRE

The PCRE package contains Perl Compatible Regular Expression libraries. These are useful for implementing regular expression pattern matching using the same syntax and semantics as Perl 5.

Package Information

User Notes: http://wiki.linuxfromscratch.org/blfs/wiki/pcre

Installation of PCRE

Install PCRE by running the following commands: 

./configure --prefix=/usr --enable-utf8 &&
make

To test the results, issue: make runtest.

Now, as the root user: 

make install &&
install -v -m755 -d /usr/share/doc/pcre-7.0/html &&
install -v -m644 doc/html/* /usr/share/doc/pcre-7.0/html &&
install -v -m644 doc/{Tech.Notes,*.txt} /usr/share/doc/pcre-7.0

If you reinstall Grep after installing PCRE, Grep will get linked against PCRE and may cause problems if /usr is a separate mount point. To avoid this, either pass the option --disable-perl-regexp when executing ./configure for Grep or move libpcre to /lib as follows. 

mv -v /usr/lib/libpcre.so.* /lib/ &&
ln -v -sf ../../lib/libpcre.so.0 /usr/lib/libpcre.so

Command Explanations

--enable-utf8: This switch includes the code for handling UTF-8 character strings in the library.

Contents

Installed Programs: pcregrep, pcretest, and pcre-config
Installed Libraries: libpcre.{so,a}, libpcrecpp.{so,a} and libpcreposix.{so,a}
Installed Directory: /usr/share/doc/pcre-7.0

Short Descriptions

pcregrep

is a grep that understands Perl compatible regular expressions.

pcretest

can test a Perl compatible regular expression.

pcre-config

is used during the compile process of programs linking to the PCRE libraries.

Last updated on 2007-04-04 21:42:53 +0200