PCRE - Perl-compatible regular expressions


#include <pcre.h>

void pcre_assign_jit_stack(pcre_extra *extra,
callback, void *data);

void pcre16_assign_jit_stack(pcre16_extra *extra,
callback, void *data);

void pcre32_assign_jit_stack(pcre32_extra *extra,
callback, void *data);


This function provides control over the memory used as a stack at run-time by a call to pcre[16|32]_exec() with a pattern that has been successfully compiled with JIT optimization. The arguments are:

extra the data pointer returned by pcre[16|32]_study()
callback a callback function
data a JIT stack or a value to be passed to the callback

If callback is NULL and data is NULL, an internal 32K block on the machine stack is used.

If callback is NULL and data is not NULL, data must be a valid JIT stack, the result of calling pcre[16|32]_jit_stack_alloc().

If callback not NULL, it is called with data as an argument at the start of matching, in order to set up a JIT stack. If the result is NULL, the internal 32K stack is used; otherwise the return value must be a valid JIT stack, the result of calling pcre[16|32]_jit_stack_alloc().

You may safely assign the same JIT stack to multiple patterns, as long as they are all matched in the same thread. In a multithread application, each thread must use its own JIT stack. For more details, see the pcrejit page.

There is a complete description of the PCRE native API in the pcreapi page and a description of the POSIX API in the pcreposix page.


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.