> And this really is simple enough that I don't want to reach for regex's for
> it. That is, I'd write it by hand rather than mess with that.
>
> Well, with re.escape it's not messy at all :
>
> import re
> def trim_mailto(s):
> regex = re.compile("^" + re.escape("mailto:";))
> return regex.sub('', s)
>
> With literally means "if you have mailto: at the beginning, replace it with
> the empty string"
>
> You could do a ltrim function in one line :
>
> def ltrim(s, x):
> return re.sub("^" + re.escape(x), '', s)
>
> Escape will take care of escaping special characters, so the regex escape(x)
> matches exactly the string "x".
I think
re.sub("^" + re.escape(x), '', s)
is a lot more messy and hard to read than
s[len(prefix):] if s.startswith(prefix) else s
it's also roughly an order of magnitude slower.
/ Anders
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