go-pcre's Introduction

go-pcre

This is a Go language package providing support for Perl Compatible Regular Expressions (PCRE).

Installation

Install the package for Debian as follows:

sudo apt-get install libpcre++-dev
go get github.com/gijsbers/go-pcre

Usage

Go programs that depend on this package should import this package as follows to allow automatic downloading:

import "github.com/gijsbers/go-pcre"

History

This is a clone of golang-pkg-pcre by Florian Weimer, which has been placed on Github by Glenn Brown, so it can be fetched automatically by Go's package installer.

Glenn Brown added FindIndex() and ReplaceAll() to mimic functions in Go's default regexp package.

Mathieu Payeur Levallois added Matcher.ExtractString().

Malte Nuhn added GroupIndices() to retrieve positions of a matching group.

Chandra Sekar S added Index() and stopped invoking Match() twice in FindIndex().

Misakwa added support for pkg-config to locate libpcre.

Yann Ramin added ReplaceAllString() and changed Compile() return type to error.

Nikolay Sivko modified name2index() to return error instead of panic.

Harry Waye exposed raw pcre_exec.

Hazzadous added partial match support.

Pavel Gryaznov added support for JIT compilation.

go-pcre's People

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go-pcre's Issues

CompileJIT is not threadsafe

pcrejit requires a separate thread specific stack. This leads to some very weird issues when using this library with multiple threads. I naively called CompileJIT in one part of the program and then used it in other parts without realizing that per thread stacks were required. This isn't featured in the documentation, nor is there a way to handle it in the current Go API.

http://www.pcre.org/original/doc/html/pcrejit.html#SEC9

http://www.pcre.org/original/doc/html/pcreapi.html#SEC8

https://stackoverflow.com/questions/28738674/is-the-pcre-library-thread-safe-if-not-which-do-you-recommend

package main

import (
	"log"

	pcre "github.com/gijsbers/go-pcre"
)

func findIndex(a pcre.Regexp) {
	for {
		// Compile a new function with JIT. Since this is running in a goroutine and
		// probably a different thread the JIT stack will be violated.
		b := pcre.MustCompileJIT("[^\\/><\\s]+", 0, 0)
		if b.FindIndex([]byte(" <p>"), 0) == nil {
			log.Fatal("b.FindIndex(...) should never equal nil")
		}

		if a.FindIndex([]byte(" <p>"), 0) == nil {
			log.Fatal("a.FindIndex(...) should never equal nil")
		}
	}
}

func main() {
	a := pcre.MustCompileJIT("[^\\/><\\s]+", 0, 0)
	for i := 0; i < 4; i++ {
		go findIndex(a)
	}
	findIndex(a)
}

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gijsbers / go-pcre Goto Github PK

go-pcre's Introduction

go-pcre

Installation

Usage

History

go-pcre's People

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go-pcre's Issues

CompileJIT is not threadsafe

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