简单的字符串匹对（非正则表达式）代码,C/C++代码库,德仔网

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【C/C++】简单的字符串匹对（非正则表达式）
作者:Amanda / 发布于2016/1/18/ 537
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
 
#define LOWER_CASE  0
#define UPPER_CASE  1
#define CHAR_ERROR  2
 
int flag = 0;
//判断字符大小写
int Judge_char_A_or_a(char c)
{
    if (c >= 'A' && c <= 'Z')
        return UPPER_CASE;
    else if (c >= 'a' && c <= 'z')
        return LOWER_CASE;
    else
        return CHAR_ERROR;
}
 
//单个字符比较
int Judge_Same(char src, char dst)
{
    int result;
    result = Judge_char_A_or_a(dst);
    switch (Judge_char_A_or_a(src))
    {
    case LOWER_CASE:
    {
                       if (result == LOWER_CASE)
                       {
                           if (src != dst)
                           {
                               return 0;
                           }
                       }
                       else if (result == UPPER_CASE)
                       {
                           if (src != (dst + 32))
                               return 0;
                       }
                       else
                           return 0;
    }
        break;
    case UPPER_CASE:
    {
                       if (result == LOWER_CASE)
                       {
                           if (src != (dst - 32))
                           {
                               return 0;
                           }
                       }
                       else if (result == UPPER_CASE)
                       {
                           if (src != dst)
                               return 0;
                       }
                       else
                           return 0;
    }
        break;
    case CHAR_ERROR:
    {
                       if (src != dst)
                           return 0;
 
    }
        break;
    default:
        break;
    }
    return 1;
}
 
//比较字符模式长度
int JudgeStrModeLen(char * str)
{
    int len = 0;
    while(*str++ != '[')
    {
        len++;
    }
    len++;
    while (*str++ != ']')
    {
 
    }
    while(*str++ != '\0')
    {
        len++;
    }
 
    return len;
}
//比较字符串
char * StrMatching(char * src, char * strmode)
{
    int i, j = 0;
 
    if ((strlen(src)) != (JudgeStrModeLen(strmode)))
    {
        return strmode;
    }
 
    for (i = 0; i < strlen(src); i++)
    {
 
        if (!Judge_Same(src[i], *strmode))
        {
            if (strmode[j] == '[')
            {
                flag = 1;
                *strmode++;
            }
            else
            {
                return strmode;
            }
 
            if (flag)
            {
                while (!Judge_Same(src[i], *strmode))
                {
                    *strmode++;
                }
                while (!Judge_Same(*strmode, ']'))
                {
                    *strmode++;
                }
                flag = 0;
            }
        }
        *strmode++;
    }
 
    return src;
}
 
 
 
int main()
{
    char str1[] = "Aab";
    char str2[] = "a2B";
    char str3[] = "ab";
    char str4[] = "ABB";
    char str_mode[] = "a[a2b]b";
 
    printf("strMode_len = %d\n", JudgeStrModeLen(str_mode));
    printf("1 %s\n", StrMatching(str1, str_mode));
    printf("2 %s\n", StrMatching(str2, str_mode));
    printf("3 %s\n", StrMatching(str3, str_mode));
    printf("4 %s\n", StrMatching(str4, str_mode));
    return 0;
}
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