10

たとえば、このようなデータを格納する列があります。

Apple
12.5.126.40
Smite
Abby
127.0.0.1
56.5.4.8
9876543210
Notes

IP形式のデータを含む行のみを選択する方法は?

試してみまし '^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$' たが、なぜ 9876543210 にも一致するのかわかりません

4

5 に答える 5

17

You're going to need to use REGEXP to match the IP address dotted quad pattern.

SELECT *
FROM yourtable
WHERE 
  thecolumn REGEXP '^[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}$'

Technically, this will match values that are not valid IP addresses, like 999.999.999.999, but that may not be important. What is important, is fixing your data such that IP addresses are stored in their own column separate from whatever other data you have in here. It is almost always a bad idea to mix data types in one column.

mysql> SELECT '9876543210' REGEXP '^[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}$';
+---------------------------------------------------------------------------+
| '9876543210' REGEXP '^[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}$' |
+---------------------------------------------------------------------------+
|                                                                         0 |
+---------------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql> SELECT '987.654.321.0' REGEXP '^[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}$';
+------------------------------------------------------------------------------+
| '987.654.321.0' REGEXP '^[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}$' |
+------------------------------------------------------------------------------+
|                                                                            1 |
+------------------------------------------------------------------------------+

Another method is to attempt to convert the IP address to a long integer via MySQL's INET_ATON() function. An invalid address will return NULL.

This method is likely to be more efficient than the regular expression.

You may embed it in a WHERE condition like: WHERE INET_ATON(thecolumn) IS NOT NULL

SELECT INET_ATON('127.0.0.1');
+------------------------+
| INET_ATON('127.0.0.1') |
+------------------------+
|             2130706433 |
+------------------------+

SELECT INET_ATON('notes');
+--------------------+
| INET_ATON('notes') |
+--------------------+
|               NULL |
+--------------------+

SELECT INET_ATON('56.99.9999.44');
+----------------------------+
| INET_ATON('56.99.9999.44') |
+----------------------------+
|                       NULL |
+----------------------------+
于 2013-02-05T02:14:36.880 に答える
3

これは最も効率的な方法ではない可能性があり、技術的には正規表現ではありませんが、うまくいくはずです:

SELECT col1 FROM t1 WHERE col1 LIKE '%.%.%.%';
于 2013-02-05T02:14:18.777 に答える
2

便利な関数 inet_aton() を使用することもできます

SELECT *
FROM yourtable
WHERE inet_aton(thecolumn) is not null
于 2013-11-13T08:37:34.983 に答える
1

長いですが、うまくいきます：

mysql> SELECT '1.0.0.127' regexp '^([0-1]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])\\.([0-1]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])\\.([0-1]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])\\.([0-1]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])$';
于 2015-05-13T08:52:25.217 に答える