Thanks guys,
Shame that it doesn't work that way. I've worked around it as suggested
below.
Thomas
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Hi Everyone,
I am creating some regular expressions programmatically with re-pattern. In
order to avoid creating the same regex pattern again I want to check if it
already exists. But comparing regex pattern doesn't seem to be work:
user= (= #test #test)
false
user= (identical? #test #test)
You can compare the output of the .pattern or .toString methods if all you care
about is finding regexes made from the exact same patterns. There's no simple
way to detect equivalent regexes made from different patterns, though.
As for why = doesn't do this, you'd have to talk to the Java folks
Clojure re-uses java.util.regex.Pattern objects. This object doesn't
override equals method,
so object references are always compared. But you can easily get pattern
string from compiled
pattern and then compare just them:
user= (= (.pattern #test) (.pattern #test))
true
Dňa streda, 26.
