庆贺元旦到来！！有一小问题:如何用正则表达式验正变量名是否符合规则?

Question

例:
$test1 = '$dfas_342441234';
$test2 = '$sdfasdfs324234@#$@#$';
能验正出以上两个符合规则.

Answer 1

没有试过，关注一下：它不是说了吗：
'[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*'

Answer 2

FUNCTION ISVARIABLE($YOURSTRING){
IF(EREG("^([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)",$YOURSTRING)
{
RETURN 1;
}ELSE
{
RETURN 0; 
}
}IF (ISVARIABLE($test1)){
 ECHO "OK";}
ELSE{
ECHO "ERROR";}

Answer 3

<?
function checkVarReg($varName){
return preg_match('/^\$[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/',$varName);
}
$test1 = '$dfas_342441234';
$test2 = '$sdfasdfs324234@#$@#$';
echo checkVarReg($test1);
echo checkVarReg($test2);
?>

Answer 4

哈哈，我看戏子兄是想放放分让大家高兴高兴吧。<?
function checkvarname($varname){
if(ereg("^[a-zA-Z_][a-zA-Z0-9_]*",$varname)){
return true;
}else{
return false; 
}
}
$test1 = 'dfas_342441234';
$test2 = '$sdfasdfs324234@#$@#$';if (checkvarname($test1)){
echo "变量名符合规则。";
}else{
echo "变量名不符合规则。";
}
?>