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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.

This package is known to build and work properly using an LFS-7.4 platform.

Package Information

• Download (HTTP): http://downloads.sourceforge.net/pcre/pcre-8.33.tar.bz2
• Download (FTP): ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.33.tar.bz2
• Download MD5 sum: 21514018448ac10062ece7a668fca949
• Download size: 1.4 MB
• Estimated disk space required: 24 MB
• Estimated build time: 0.3 SBU

PCRE Dependencies

Optional

Valgrind

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

Installation of PCRE

Install PCRE by running the following commands:

./configure --prefix=/usr                     \
            --docdir=/usr/share/doc/pcre-8.33 \
            --enable-unicode-properties       \
            --enable-pcre16                   \
            --enable-pcre32                   \
            --enable-pcregrep-libz            \
            --enable-pcregrep-libbz2          \
            --enable-pcretest-libreadline     \
            --disable-static                 &&
make

To test the results, issue: make check.

Now, as the root user:

make install                     &&
mv -v /usr/lib/libpcre.so.* /lib &&
ln -sfv ../../lib/$(readlink /usr/lib/libpcre.so) /usr/lib/libpcre.so

Command Explanations

--enable-unicode-properties: This switch enables Unicode properties support and includes the code for handling UTF-8/16/32 character strings in the library. You need this switch if you are going to build GLib-2.38.2 with the --with-pcre=system switch.

--enable-pcre16: This switch enables 16 bit character support.

--enable-pcre32: This switch enables 32 bit character support.

--enable-pcregrep-libz: This switch adds support to pcregrep to read .gz compressed files.

--enable-pcregrep-libbz2: This switch adds support to pcregrep to read .bz2 compressed files.

--enable-pcretest-libreadline: This switch adds line editing and history features to pcretest program.

--disable-static: This switch prevents installation of static versions of the libraries.

mv -v /usr/lib/libpcre.so.* /lib: Moves the PCRE library on the root filesystem so that it is available in case grep gets reinstalled with PCRE support.

Contents

Installed Programs:pcregrep, pcretest and pcre-config

Installed Libraries:libpcre.so, libpcre16.so, libpcre32.so, libpcrecpp.so and libpcreposix.so

Installed Directory:/usr/share/doc/pcre-8.33

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.