QuantLib::ExtendedEqualJumpsBinomialTree – Base class for equal jumps binomial tree. Synopsis virtual Real probUp (Time stepTime) const =0 virtual Real dxStep (Time stepTime) const =0 Protected Attributes Inherits ExtendedBinomialTree< T >. Public Member Functions ExtendedEqualJumpsBinomialTree (const boost::shared_ptr< StochasticProcess1D > &process, Time end, Size steps) Real underlying (Size i, Size index) const Real probability (Size i, Size,…
PCRE – Perl-compatible regular expressions Utf-8, Utf-16, Utf-32, And Unicode Property Support As well as UTF-8 support, PCRE also supports UTF-16 (from release 8.30) and UTF-32 (from release 8.32), by means of two additional libraries. They can be built as well as, or instead of, the 8-bit library. Utf-8 Support In order process UTF-8 strings,…
PCRE – Perl-compatible regular expressions Pcre Regular Expression Syntax Summary The full syntax and semantics of the regular expressions that are supported by PCRE are described in the pcrepattern documentation. This document contains a quick-reference summary of the syntax. Quoting \x where x is non-alphanumeric is a literal x \Q…\E treat enclosed characters as literal Characters \a alarm,…
PCRE – Perl-compatible regular expressions Pcre Discussion Of Stack Usage When you call pcre[16|32]_exec(), it makes use of an internal function called match(). This calls itself recursively at branch points in the pattern, in order to remember the state of the match so that it can back up and try a different alternative if the…
PCRE – Perl-compatible regular expressions Pcre Sample Program A simple, complete demonstration program, to get you started with using PCRE, is supplied in the file pcredemo.c in the PCRE distribution. A listing of this program is given in the pcredemo documentation. If you do not have a copy of the PCRE distribution, you can save…
PCRE – Perl-compatible regular expressions Saving And Re-Using Precompiled Pcre Patterns If you are running an application that uses a large number of regular expression patterns, it may be useful to store them in a precompiled form instead of having to compile them every time the application is run. If you are not using any…
PCRE – Perl-compatible regular expressions. Synopsis #include <pcreposix.h> int regcomp(regex_t *preg, const char *pattern, int cflags); int regexec(regex_t *preg, const char *string, size_t nmatch, regmatch_t pmatch[], int eflags); size_t regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size); void regfree(regex_t *preg); Description This set of functions provides a POSIX-style API for the PCRE regular expression…
PCRE – Perl-compatible regular expressions Pcre Performance Two aspects of performance are discussed below: memory usage and processing time. The way you express your pattern as a regular expression can affect both of them. Compiled Pattern Memory Usage Patterns are compiled by PCRE into a reasonably efficient interpretive code, so that most simple patterns do…
PCRE – Perl-compatible regular expressions Pcre Regular Expression Details The syntax and semantics of the regular expressions that are supported by PCRE are described in detail below. There is a quick-reference syntax summary in the pcresyntax page. PCRE tries to match Perl syntax and semantics as closely as it can. PCRE also supports some alternative…
PCRE – Perl-compatible regular expressions Partial Matching In Pcre In normal use of PCRE, if the subject string that is passed to a matching function matches as far as it goes, but is too short to match the entire pattern, PCRE_ERROR_NOMATCH is returned. There are circumstances where it might be helpful to distinguish this case…
PCRE – Perl-compatible regular expressions Pcre Matching Algorithms This document describes the two different algorithms that are available in PCRE for matching a compiled regular expression against a given subject string. The "standard" algorithm is the one provided by the pcre_exec(), pcre16_exec() and pcre32_exec() functions. These work in the same as as Perl’s matching function,…
PCRE – Perl-compatible regular expressions Size And Other Limitations There are some size limitations in PCRE but it is hoped that they will never in practice be relevant. The maximum length of a compiled pattern is approximately 64K data units (bytes for the 8-bit library, 16-bit units for the 16-bit library, and 32-bit units for…
PCRE – Perl-compatible regular expressions Pcre Just-In-Time Compiler Support Just-in-time compiling is a heavyweight optimization that can greatly speed up pattern matching. However, it comes at the cost of extra processing before the match is performed. Therefore, it is of most benefit when the same pattern is going to be matched many times. This does…
PCRE – Perl-compatible regular expressions. Synopsis Of C++ Wrapper #include <pcrecpp.h> Description The C++ wrapper for PCRE was provided by Google Inc. Some additional functionality was added by Giuseppe Maxia. This brief man page was constructed from the notes in the pcrecpp.h file, which should be consulted for further details. Note that the C++ wrapper…
PCRE – Perl-compatible regular expressions Differences Between Pcre And Perl This document describes the differences in the ways that PCRE and Perl handle regular expressions. The differences described here are with respect to Perl versions 5.10 and above. 1. PCRE has only a subset of Perl’s Unicode support. Details of what it does have are…
PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> int (*pcre_callout)(pcre_callout_block *); int (*pcre16_callout)(pcre16_callout_block *); int (*pcre32_callout)(pcre32_callout_block *); Description PCRE provides a feature called "callout", which is a means of temporarily passing control to the caller of PCRE in the middle of pattern matching. The caller of PCRE provides an external function by putting its entry…
PCRE – Perl-compatible regular expressions Building Pcre PCRE is distributed with a configure script that can be used to build the library in Unix-like environments using the applications known as Autotools. Also in the distribution are files to support building using CMake instead of configure. The text file README contains general information about building with…
PCRE – Perl-compatible regular expressions #include < pcre.h> Pcre Native Api Basic Functions pcre *pcre_compile(const char *pattern, int options, const char **errptr, int *erroffset, const unsigned char *tableptr); pcre *pcre_compile2(const char *pattern, int options, int *errorcodeptr, const char **errptr, int *erroffset, const unsigned char *tableptr); pcre_extra *pcre_study(const pcre *code, int options, const char **errptr); void…
PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> const char *pcre_version(void); const char *pcre16_version(void); const char *pcre32_version(void); Description This function (even in the 16-bit and 32-bit libraries) returns a zero-terminated, 8-bit character string that gives the version number of the PCRE library and the date of its release. There is a complete description of the…
PCRE – Perl-compatible regular expressions Synopsis #include <pcre.h> int pcre32_utf32_to_host_byte_order(PCRE_UCHAR32 *output, PCRE_SPTR32 input, int length, int *host_byte_order, int keep_boms); Description This function, which exists only in the 32-bit library, converts a UTF-32 string to the correct order for the current host, taking account of any byte order marks (BOMs) within the string. Its arguments are:…