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This article mainly introduces what pcre means. It is very detailed and has certain reference value. Friends who are interested must finish reading it.

PCRE (PerlCompatibleRegularExpressions) is a Perl library, including a perl-compatible library of regular expressions. It is useful to use the same syntax and semantics as Perl5 when performing regular expression pattern matching. Boost is so huge that after using boostregex, the compilation speed of the program slows down significantly. After testing the same program, it takes 3 seconds to compile with boost::regex and less than 1 second with pcre. Therefore, pcre is used to solve the problem of using regular expressions in C language.

What is a brief introduction to PCRE

PCRE (PerlCompatibleRegularExpressions Chinese meaning: Perl language compatible with regular expressions) is a regular expression function library written in C language, written by Philip. Written by PhilipHazel. PCRE is a lightweight library of functions that is much smaller than regular expression libraries such as Boost. PCRE is easy to use and powerful, surpassing the POSIX regular expression library and some classic regular expression libraries [1].

The comparison with the Boost regular expression library shows that the performance of the two sides is about the same. PCRE is faster when matching simple strings, while Boost is better when matching longer strings-- but the gap between the two is very small. Considering the size and ease of use of PCRE, we can think that PCRE is more worthy of consideration.

PCRE is widely used in many open source software, the most famous of which is the ApacheHTTP server and the PHP scripting language, the R scripting language, and, as its name suggests, PCRE is also the default regular library of the perl language.

PCRE is implemented in C language, and its C++ implementation version is PCRE++.

The latest version of PCRE is 8.33 and can be downloaded from its official website, which can be found in the extended Reading section.

What is the installation and use of PCRE

1. Home address: wwwpcreorg

Download pcre-7.8tarbz2

2. Decompress:

Tarxjpfpcre-7.8tarbz2

3. Configuration:

Cdpcre-7.8

. / configure--prefix=/usr/local/pcre-7.8--libdir=/usr/local/lib/pcre--includedir=/usr/local/include/pcre

Configure has many parameters to match, see. / configure--help and manual for details

4. Compile:

Make

5. Install:

Makeinstall

6. Check:

Ls/usr/local checks if there is a pcre-7.8 directory

Ls/usr/local/lib checks if there is a pcre directory

Ls/usr/local/include checks if there is a pcre directory

The above is all the contents of this article "what does pcre mean?" Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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