Some Problems With Regular Expression

[hunglduc]

why if statement if executed but else statement not executed.

$str="welcome to php";	if(ereg("[^a-z]",$str))		echo "don't appear<br />";	else		echo "appear<br />";

[jlhaslip]

The If clause is activated when the If statement is true.The else clause is only activated when the If statement is false.Only one of them should work.

[Synook]

I think he's asking why that regular expression matches. The reason is, you are asking whether there are any non-alphabetic characters in the string "welcome to php", and since the spaces " " are not included in the set [a-z] the expression matches those and returns true.