Hello,
I have got objects with very large regular expressions:
class Product(models.Model):
# ...
canonical_name = models.CharField(max_length=200)
spelling_variants = models.CharField(max_length=10000, blank=True)
lexical_variants = models.CharField(max_length=10000, blank=True)
excluded = models.CharField(max_length=10000, blank=True)
permutations = models.CharField(max_length=1000, blank=True)
When a product has values for all of the above attributes, it can
calculate all its possible names. Example: the product 'google android
1.1' has several hundred possible names including these:
google android-1.1, oha android-1.1, android-1.1, google android-1,1,
oha android-1,1, android-1,1, google android-1-1, oha android-1-1,
android-1-1, google android-11, oha android-11, android-11, google
android-1 1, oha android-1 1, android-1 1, google android1.1, oha
android1.1, android1.1, google android1,1, oha android1,1, android1,1,
google android1-1, oha android1-1, android1-1, google android11, oha
android11, android11, google android1 1, oha android1 1, android1 1,
google android 1.1, oha android 1.1, android 1.1, google android 1,1,
oha android 1,1,
There are products with many more names. Consider the name of the
mobile phone alcatatel one-touch-800-one-touch-chrome.
Currently every product calculates all its possible names and a
regular expression that includes the disjunction of all the possible
names and compiles this regular expression at the time when the
product is used. This is very inefficient. I would like to compile and
store the regular expression only once: at the time when the new
product is saved.
However, there doesn't seem to be a models.RegexField. There is a
forms.RegexField, but I don't understand how I could use it in the
product model.
Any tips how to store the compiled regex?
Santiago
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