Question

我有一个这样的文本文件：

ip_rule '100 120 16.54'
qos_rule '8074 4462'
info 'Updated on 2015'

我希望这个文字是这样的：

ip_rule='100 120 16.54'
qos_rule='8074 4462'
info='Updated on 2015'

因此，它只会替换''之外的空格，并将其更改为等号=。我怎么能用PHP做到这一点，我尝试用str_replace替换它们，但它取代了整个空格。

Answer 1

您可以使用=跳过规则。例如，在您当前的示例中，这将跳过单引号中的任何内容，然后查找任何水平空格（如果可以有多个，并且只应用一个+替换，请使用'.*?'(*SKIP)(*FAIL)|\h量词）：< / p>

echo preg_replace("/'.*?'(*SKIP)(*FAIL)|\h/", '=', "ip_rule '100 120 16.54'
qos_rule '8074 4462'
info 'Updated on 2015'");

演示：https://regex101.com/r/umaQdY/1

PHP用法：

#include <iostream>
#include "stdlib.h"


using namespace std;


int main ()
{
int n;            //number of array A elements
int m=1, l=1;     //number of Array B and C correspondly

cout<<"Please enter n: ";
cin>>n;                                       //number input

float *A = (float *) malloc (n*sizeof(float));//dynamic array A definition

for (int i=0;i<n;i++)                         //array A filling
{
cout<<"Please enter A["<<i<<"]= ";
cin>>A[i];
}

float *B = (float *) malloc (m*sizeof(float));//Array B definition with 1 element for beginning
float *C = (float *) malloc (l*sizeof(float));//Array C definition with 1 element for beginning

for (int i=0;i<n;i++)
{
if(A[i]!=0)
    {
    if(A[i]>0) 
        {
        B[m-1] = A[i];
        B = (float *) realloc (B, (m++)*sizeof(float));
        }
    else
        {
        C[l-1] = A[i];
        C = (float *) realloc (C, (l++)*sizeof(float));
        }
    }

}
if(m>2) B = (float *) realloc (B, (m--)*sizeof(float)); //because arrays created with 1 extra elements
if(l>2) C = (float *) realloc (C, (l--)*sizeof(float)); //need delete last element that doesn`t have a number

for (int i=0;i<n;i++)
{
cout<<"A["<<i<<"]= "<<A[i]<<endl;
}

free(A);

cout<<endl;

for (int i=0;i<m;i++)
{
cout<<"B["<<i<<"]= "<<B[i]<<endl;
}

free(B);

cout<<endl;

for (int i=0;i<l;i++)
{
cout<<"C["<<i<<"]= "<<C[i]<<endl;
}

cout<<endl;

free(C);


return 0;
}

PHP演示：https://eval.in/663922

您可以在此处详细了解http://www.rexegg.com/regex-best-trick.html#pcrevariation。

如何使用preg_replace替换双单引号外的文本？

1 个答案: