Split string by regex

Hello,

I'm working on a library OPAC system with books classified using the Library of Congress classification system. This takes the format of either one or two letters followed by some numbers, i.e. R272 or RA440 etc. What I want to do is split the field that holds this classification into two, one containing the letter portion and the other containing the number bit. So

+-------+
| Class |
+-------+
| R100 |
+-------+
| RA65 |
+-------+
| RP2 |
+-------+

Would become

+--------+--------+
| Class | Class2 |
+--------+--------+
| R | 100 |
+--------+--------+
| RA | 65 |
+--------+--------+
| RP | 2 |
+--------+--------+
etc

Could this be done in MySQL? I want to do something along the lines of set class2 = SUBSTRING_INDEX(class,'[A-Z]',-1) but I understand this is not possible.

Any ideas?

Regards

Adam

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RE: Split string by regex

Since your conditions are pretty specific you can do this:

set @a=3D'RA100';
select IF(@a REGEXP '[A-Za-z]{2}', SUBSTRING(@a,1,2), SUBSTRING(@a,1,1)) as=
letter, IF(@a REGEXP '[A-Za-z]{2}', SUBSTRING(@a,3), SUBSTRING(@a,2));


+--------+--------+
| letter | number |
+--------+--------+
| RA | 100 |
+--------+--------+


If this looks ugly, then that should be good motivation not to store multip=
le pieces of data as concatenated strings =3D)

Regards,
Gavin Towey

-----Original Message-----
From: Adam Gray [mailto:acgray@me.com]
Sent: Tuesday, August 03, 2010 8:04 AM
To: mysql@lists.mysql.com
Subject: Split string by regex

Hello,

I'm working on a library OPAC system with books classified using the Librar=
y of Congress classification system. This takes the format of either one or=
two letters followed by some numbers, i.e. R272 or RA440 etc. What I want =
to do is split the field that holds this classification into two, one conta=
ining the letter portion and the other containing the number bit. So

+-------+
| Class |
+-------+
| R100 |
+-------+
| RA65 |
+-------+
| RP2 |
+-------+

Would become

+--------+--------+
| Class | Class2 |
+--------+--------+
| R | 100 |
+--------+--------+
| RA | 65 |
+--------+--------+
| RP | 2 |
+--------+--------+
etc

Could this be done in MySQL? I want to do something along the lines of set =
class2 =3D SUBSTRING_INDEX(class,'[A-Z]',-1) but I understand this is not p=
ossible.

Any ideas?

Regards

Adam

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