Today i was trying to write a regular expression to remove blank lines using the PHP method preg_replace.
After googling it i found this solution being posted online.
PHP: $s = preg_replace("/(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]+/","",$s);
Perl: $s =~ s/(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]//g;
Input:
-----------------------
hello
-----------------------
Output:
-----------------------
hello-----------------------
Not very nice. Seems that this expression removes newline characters from cases like “string\n\n”.
What it should look like.
-----------------------
hello
-----------------------
My solution:
PHP: $s = preg_replace("/^\n+|^[\t\s]*\n+/m", "", $s);
Perl: $s =~ s/^\n+|^[\t\s]*\n+//mg; #we need to use the g modifier to replace all occurrences preg_replace does this by default.
Output:
-----------------------
hello
-----------------------
Much better. 
I’m adding a programming section containing algorithms and other programming related topics.
I was playing around with c and creating pseudo type objects.
Objects.c
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| #include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define NAMESIZ 32 /*size of name array */
typedef struct object
{
char name[NAMESIZ];
int number;
void (*print)(struct object*); /*function pointer declarations*/
int (*getNumber)(struct object*);
} Object;
void object_print(Object* this) /* functions which do operations on the Object structure */
{
printf("%s\n", this->name);
}
int object_getNumber(Object *this)
{
return this->number;
}
Object * object_create(char* name, int number) /*creates a new Object and returns a Object pointer*/
{
Object * obj = NULL;
if((obj = malloc(sizeof(Object))) != NULL)
{
strncpy(obj->name, name, NAMESIZ);
obj->print = &object_print; /*set function pointer for print*/
obj->getNumber = &object_getNumber; /*set function pointer for getNumber*/
obj->number = number;
}
return obj;
}
void object_delete(Object ** obj) /*free a Object from memory and sets the Object pointer to NULL*/
{
free(*obj);
*obj = NULL;
}
int main()
{
Object * obj = NULL;
if((obj = object_create("My Name", 70)) != NULL)
{
(*obj->print)(obj); /*call void function print. Also we could make a operation on the object by object_print(obj); */
printf("%d\n", (*obj->getNumber)(obj)); /*call int getNumber function*/
object_delete(&obj);
}
#ifdef WIN32
system("pause");
#endif
return 0;
} |
Made a update to my current projects.
Hello World!
This site is up and running.