正则表达式查询要从字符串中分离并提取两个不同的集合？

Question

I need to extract two seperate information from a string.

For example,

$string = 'int(5)';
//Now I need "int" and the text inside the brackets "5" seperately;
$datatype = ?
$varlength = ?

How to extract those information?

Answer 1

Use this regex

^([az]+)\\(([0-9]+)\\)$

if (preg_match('~^([a-z]+)\(([0-9]+)\)$~i', 'int(5)', $matches)) {
  $datatype  = $matches[1]; // int
  $varlength = $matches[2]; // 5
}

---

EDIT

If you want to match more than just a number in the brackets, expand it as necessary:

^([a-z]+)\(([0-9a-zA-Z, ]+)\)$ // numbers, letters, comma or space
^([a-z]+)\(([^)]+)\)$          // anything but a closing bracket

Answer 2

One way:

list($datatype, $varlength) = explode('(', trim($string, ')'));

This only works if there can be only one opening bracket.

Reference: list , explode , trim .

Answer 3

In the case. you want to match anything inside the brackets, use this

preg_match('/^([a-z]+)\(([a-zA-Z0-9\,]+)\)$/', 'enum(1,a)' , $matches);
print_r($matches);