字符串模式匹配和插入

String pattern matching and insertion C++

本文关键字:插入 模式匹配 字符串      更新时间:2023-10-16

我正在尝试匹配并插入字符串中的模式。

Good peo Good peo中,我正在搜索peo并插入ple

但是输出是这样的:

Good people Good peo /n
Good peo Good people

我需要输出像

Good people Good people
我的代码:

#include<stdio.h>
#include<stdlib.h>
#include<iostream>
#include<string>
#include<string.h>
using namespace std;
int length(char s[])
{
    int len=0;
    int i=0;
    while(s[i]!='')
    {
        i++;
        len++;
    }
    return len;
}
void concatenate(char s1[], char s2[])
{
    int i=length(s1);
    int j=length(s2);
    int count=0;
    while(count<=j)
    {
        s1[i]=s2[count];
        i++;
        count++;
    }
}
void substring(char s[], char dest[], int ip, int len)
{
    int i=ip;
    int count=0;
    while(count<len)
    {
        dest[count]=s[i];
        count++;
        i++;
    }
    dest[count]='';
}
void ins(char T[], int ip, char P[])
{
    char temp1[100];
    char temp2[100];
    substring(T, temp1, 0, ip);
    substring(T, temp2, ip, length(T)-ip);
    concatenate(temp1, P);
    concatenate(temp1, temp2);
    T=temp1;
    cout<<T<<endl;
}
void del(char T[], int ip, int L)
{
    char temp1[100];
    char temp2[100];
    substring(T, temp1, 0, ip);
    substring(T, temp2, ip+L, length(T)-ip-L);
    concatenate(temp1, temp2);
    T=temp1;
    cout<<T<<endl;
}
//where T is the original string and P is the pattern to be deleted whereever it appears in the original string.
void delpat(char T[], char P[])
{
    char temp[100];
    for(int i=0; i<=length(T); i++)
    {
        substring(T, temp, i, length(P));
        if(strcmp(temp, P)==0)
            del(T, i, length(P));
    }
}
//where T is the original string, Q is the pattern to be inserted and P is the pattern after which it is inserted.
void inspat(char T[], char P[], char S[])
{
    char temp[100];
    for(int i=0; i<=length(T); i++)
    {
        substring(T, temp, i, length(P));
        if(strcmp(temp, P)==0)
            ins(T, i+length(P), S);
    }
}
int main()
{ char a[100];
    char T[]="Good peo Good peo";
    char P[]="peo";
    char S[]="ple";
    inspat(T, P, S);
    gets(a);
}

1)函数ins()中的赋值不会改变调用者的值:

T=temp1;
cout<<T<<endl;

您需要使用strcpy()来复制temp1字符数组:

strcpy(T, temp1);
cout<<T<<endl;

2)由于您想要在插入之后打印所有出现,因此需要删除上面的cout,您可以在main()inspat()的末尾(在for循环之外)打印T:

cout<<T<<endl;

3)由于插入发生在原始数组中,因此需要确保数组足够大。在main():

中执行类似的操作
char T[256]="Good peo Good peo"; // 256 is some arbitrary size