PHP Regular Determine Whether the Input Is a Letter Example Program_PHP Tutorial

To determine whether it is a pure letter in php, we can directly use the regular /^[a-zA-Z]$/ to verify, including uppercase and lowercase letters. Students who need to know more can refer to it.

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if (preg_match('/^[a-zA-Z]+$/',$str))
{
echo $str."is a letter";
}
else
{
echo $str."Not a letter";
}

The code is as follows

代码如下	复制代码
header('Content-type: text/html; charset=utf-8'); $str = "dasdadsfsadASDSADS"; if (preg_match('/^[a-zA-Z]+$/',$str)) { echo $str."是字母"; } else { echo $str."不是字母"; } ?>

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代码如下	复制代码
preg_match('/^[a-zA-Z]+$/',$str)

header('Content-type: text/html; charset=utf-8');

$str = "dasdadsfsadASDSADS";

代码如下	复制代码
if(preg_match("/^d*$/", "4312")) { echo "全数字 "; } if(preg_match("/^[a-z]*$/i", "fdsFDfd")) { echo "全字母 "; } if(preg_match("/^[a-zd]*$/i", "fd4fd34")) { echo "有数字有字母 "; }

?>

This is the code Returns TRUE if it is a letter, otherwise returns FALSE Other judgments

The code is as follows

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if(preg_match("/^d*$/", "4312")) { echo "All numbers "; } if(preg_match("/^[a-z]*$/i", "fdsFDfd")) { echo "Full letters "; } if(preg_match("/^[a-zd]*$/i", "fd4fd34")) { echo "There are numbers and letters "; } http://www.bkjia.com/PHPjc/631265.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631265.htmlTechArticleTo determine whether it is a pure letter in php, we can directly use the regular /^[a-zA-Z]$/ Come and verify, including uppercase and lowercase letters. Students who need to know more can refer to it. The code above is as follows...