RichTextBox - read adjacent chars to selection

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Hi.
In order to activate a button in my program I need to read a selected text from a richtextbox and to check if that selection is between "<" and ">".
Example: if selection is "123456" and if the previous character is "<" and the following character is ">" (so the entire text is something like ..<123456>..) then the button will be checked. Otherwise, the checked property of the button needs to be False.
How do I do that? Thanks

Posted 28-Oct-10 2:29am

RoDiesel

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Rajesh Anuhya 28-Oct-10 8:33am

No Effort

Toli Cuturicu 28-Oct-10 12:11pm

Fake answer from OP:
The button that I need is like the BOLD button in Word. If the selected text is written with Bold letter, then the "B" button is checked. And vice-versa.
In my program, I have to check the selected string, and if it is between "<" and ">" (these two characters aren't selected), then the button is highlighted (Checked = TRUE) and the program can perform some additional tasks.
If I try to select the text in front of the initially selected text (123456), the SelectionChanged event is launched (once again)... so not a good option.

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Gordon Kushner · Answer 1 · 2010-10-28T02:38:00

Solution 2

Regular Expressions are your best friend in this situation. Here[^]

Hook an event for your rich text box like KeyUp and evaluate the string in the text box.

Posted 28-Oct-10 2:38am

Gordon Kushner

Updated 28-Oct-10 2:40am

v3

RDBurmon · Answer 2 · 2010-10-28T02:38:00

Solution 1

Why do you make this automatic ?
just check /validate this things on button click.

Posted 28-Oct-10 2:38am

RDBurmon