How do I find possible matches using regular expression?
Andy
icetortoise at gmail.com
Thu Nov 23 07:53:54 EST 2006
The seems good to me, I'll try it out, thanks for the posting.
"Peter Otten 写道:
"
> Andy wrote:
>
> > I'm trying to do some predicting work over user input, here's my
> > question:
> >
> > for pattern r'match me', the string 'no' will definitely fail to match,
> > but 'ma' still has a chance if user keep on inputting characters after
> > 'ma', so how do I mark 'ma' as a possible match string?
>
> The following may or may not work in the real world:
>
> import re
>
> def parts(regex, flags=0):
> candidates = []
> for stop in reversed(range(1, len(regex)+1)):
> partial = regex[:stop]
> try:
> r = re.compile(partial + "$", flags)
> except re.error:
> pass
> else:
> candidates.append(r)
> candidates.reverse()
> return candidates
>
> if __name__ == "__main__":
> candidates = parts(r"[a-z]+\s*=\s*\d+", re.IGNORECASE)
> def check(*args):
> s = var.get()
> for c in candidates:
> m = c.match(s)
> if m:
> entry.configure(foreground="#008000")
> break
> else:
> entry.configure(foreground="red")
>
>
> import Tkinter as tk
> root = tk.Tk()
> var = tk.StringVar()
> var.trace_variable("w", check)
> entry = tk.Entry(textvariable=var)
> entry.pack()
> root.mainloop()
>
> The example lets you write an assignment of a numerical value, e. g
>
> meaning = 42
>
> and colours the text in green or red for legal/illegal entries.
>
> Peter
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