[Tkinter-discuss] How can I edit a string inside a textbox?
fredrik at pythonware.com
Thu Dec 6 12:27:17 CET 2007
Alex Garipidis wrote:
> I have a Tkinter Textbox in my application. I want to scan the
> textbox for a symbol, defined by me as a "mark", and
> change the word that is inside or next to that symbol.
> This is what i mean:
> If a user types this to the textbox:
> "Hello @everybody, how are you doing?"
> I want to scan this string for the "@" character (or something
> else) and edit the word next to it (or "inside" it, e.g.
> "@everybody@"), "everybody" in this case, and make it have
> a color for example or make it underlined.
to find things in a text widget, use the "search" method:
pos = text.search(string, start)
where "string" is the string you want to search for, and start is the
starting position (e.g. 1.0 or INSERT).
to search for things that match "@word", where "word" is an arbitrary
string of letters or digits, you can use a regular expression, e.g.
pos = text.search("@\w+", 1.0, regexp=True)
search only returns where the match begins; to find the end of "@word",
you can search from the given position to the first thing that isn't a
end = text.search("\W", pos + " 1 char", regexp=True)
to change the appearance of a block of text, register the style using
tag_config, and then use tag_add to apply the style tag to the block, e.g.:
# do this when you create the widget
# do this to apply this style to a range of text
text.tag_add("mystyle", pos, end)
hope this helps!
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