expression help

[Destramic]

im in need of some help on a bit of regex...im trying to learn but my effort isnt work so i need some help please

 

the problem im having is this part of the scipt

 

if (preg_match('/^[A-Za-z0-9_]\s=\s[A-Za-z0-9_]$/', $i))

 

i want to beable to check the value is in the format of:

 

test_123=test123_123 (only letter number and underscores)

 

if anyone would could help me or give me some points on my regex i'd be very greatful thanks

 

	    while ($i = fgets($file))
    {
    	if (!preg_match('/^\s*$/', $i))
    	{
      		if (preg_match('/^[A-Za-z0-9_]\s=\s[A-Za-z0-9_]$/', $i))
      		{
      			preg_match('/^(.*?)=(.*?)$/', $i, $found);
      			
	      		$name                 = trim($found[1]);
	      		$value                = trim($found[2]);
	      		$this->_values[$name] = $value;
      		}
      	}
    }

[requinix]

Your expression looks for, in order: the beginning of the string, one letter/number/underscore, a whitespace character, an equals sign, another whitespace character, another letter/number/underscore, and the end of the string.

Note how none of those words were plural...

 

There's no need to nest preg_matches. Just do it all at once.

read line
if (preg_match('/^\w+=\w+$/', line)) {
    line is good
}

By the way, unless you say something otherwise, I'll assume there's nothing more specific than "letters, numbers, and underscores" - no format, no restrictions, nothing but any combination of those characters.

[Destramic]

thank i had to remove ^ and $ from the expression to make it work

if (preg_match('/\w += +\w/', $i))

 

also im trying to match any strings in the format of

 

test[] = hello

test[] = bye

 

the expression below does work im just wondering if there is any faults with it as im new to this...thanks

 

else if (preg_match('/^^[A-Za-z0-9_][]$ += +[A-Za-z0-9_]/', $i))

[Destramic]

test[] = hello

test[] = bye

 

the expression below does work im just wondering if there is any faults with it as im new to this...thanks

 

else if (preg_match('/^^[A-Za-z0-9_][]$ += +[A-Za-z0-9_]/', $i))

 

anyone?

[.josh]

You need to escape a lot of that stuff, as they have special meaning in regex. For example, you have [A-Za-z0-9_] which you know is a character class to specify a range of characters.  Well [..] encloses and specifies that it is a character class.  But then you turn around and try to use [] to match a literal []...how does the engine know you now want to use those brackets to match literal brackets? Only way for it to know is if you escape the characters \[\]

 

You also have all kinds of stuff in there that just doesn't belong at all.  I suggest you go back to reading about what the symbols in a regex pattern actually do.

 

preg_match('/\w+\[\] = \w+/',$i)

 

or if you wanted to capture separate the parts:

 

preg_match('/(\w+\[\]) = (\w+)/',$i,$match)