使用 TRE 的模糊正则表达式匹配 [英] Fuzzy regex match using TRE

问题描述

我正在尝试在我的 C 程序中使用 TRE 库来执行模糊正则表达式搜索.我设法通过阅读文档拼凑了这段代码:

I'm trying to use the TRE library in my C program to perform a fuzzy regex search. I've managed to piece together this code from reading the docs:

regex_t rx;
regcomp(&rx, "(January|February)", REG_EXTENDED);
int result = regexec(&rx, "January", 0, 0, 0);

然而，这只会匹配一个精确的正则表达式(即不允许拼写错误).我没有看到任何允许在这些函数中设置模糊性的参数:

However, this will match only an exact regex (i.e. no spelling errors are allowed). I don't see any parameter which allows to set the fuzziness in those functions:

int regcomp(regex_t *preg, const char *regex, int cflags); 
int regexec(const regex_t *preg, const char *string, size_t nmatch, 
        regmatch_t pmatch[], int eflags); 

如何设置模糊程度(即最大 Levenshtein 距离)，以及如何获得匹配的 Levenshtein 距离?

How can I set the level of fuzziness (i.e. maximum Levenshtein distance), and how do I get the Levenshtein distance of the match?

我忘了提及我使用的是 GnuWin32 的 Windows 二进制文件，它们仅适用于 0.7.5 版.0.8.0 的二进制文件仅适用于 Linux.

I forgot to mention I'm using the Windows binaries from GnuWin32, which are available only for version 0.7.5. Binaries for 0.8.0 are available only for Linux.

推荐答案

感谢@Wiktor Stribiżew，我找到了我需要使用的函数，并成功编译了一个工作示例:

Thanks to @Wiktor Stribiżew, I found out which function I need to use, and I've successfully compiled a working example:

#include <stdio.h>
#include "regex.h"
int main() {
    regex_t rx;
    regcomp(&rx, "(January|February)", REG_EXTENDED);

    regaparams_t params = { 0 };
    params.cost_ins = 1;
    params.cost_del = 1;
    params.cost_subst = 1;
    params.max_cost = 2;
    params.max_del = 2;
    params.max_ins = 2;
    params.max_subst = 2;
    params.max_err = 2;

    regamatch_t match;
    match.nmatch = 0;
    match.pmatch = 0;

    if (!regaexec(&rx, "Janvary", &match, params, 0)) {
        printf("Levenshtein distance: %d\n", match.cost);
    } else {
        printf("Failed to match\n");
    }

    return 0;
}

这篇关于使用 TRE 的模糊正则表达式匹配的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！