There is a trouble that it is not goes well at reading one line regular expression.
I would like to code if only one dot contained in a line, issue an alert.
$file = fopen("test.txt", "r");
if($file){
while($line = fgets($file)){
if(preg_match('/^.$/', $line)){
echo "please write again.<br>";
} else {
echo "OK<br>";
}
}
}
fclose($file);
Regular expression does not work well in this code.
add half-width dot in the regular expression
if($file){
while($line = fgets($file)){
if(preg_match('/^..$/', $line)){
echo "please write again.<br>";
} else {
echo "OK<br>";
}
}
}
A half-size dot in a regular expression means an arbitrary one character.
