Since your conditions are pretty specific you can do this:
set @a='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 multiple
pieces of data as concatenated strings =)
Regards,
Gavin Towey
-----Original Message-----
From: Adam Gray [mailto:acg...@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 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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