PHP introductory learning knowledge point 4: Basic application of PHP regular expressions_PHP tutorial

Copy code The code is as follows:

//regular expression
// ereg is case sensitive
if(ereg("([A-Z]{3,})", "AAA")){
echo "Capital letters match!
";
}else{
echo "no";
}
if(ereg("([A-Z]{3,})", "aaa")){
echo "yes";
}else{
echo "Lowercase cannot be matched!
";
}
// eregi is not case sensitive
if(eregi("([A-Z]{3,})","Aaaa")) {
echo "Can match both uppercase and lowercase letters!";
}
//Return the matching value
if(ereg("^(0[0-9]{2,3})- ([0-9]{7,8})","0592-5337138",$regs)){
echo "The return value 0 subscript is the original string $regs[0]
";
echo "Return the area code (i.e. the first matching string)".$regs[1]."
";
echo("Return the phone number (i.e. the second matching string)$regs[2 ]
");
}
?>

30-minute introductory tutorial on regular expressions
Basic information on regular expressions

http://www.bkjia.com/PHPjc/323829.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/323829.htmlTechArticleCopy the code The code is as follows: ?php //regular expression// ereg is case sensitive if(ereg("( [A-Z]{3,})", "AAA")){ echo "uppercase matches! br"; }else{ echo "no"; } if(ereg("([A-Z]{3,})", "a...