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If you finish a sentence with ".", "?" or "!" followed by white space or new line, we know that a new sentence follows, which should start with a capital (uppercase) letter. Here is a simple script, which fixes accidental lower case there, as it was discussed here.

It is a simple state machine, monitoring key presses. If ever a mouse key or special keyboard key is pressed, like {Up}, {RShift} or {F1} we get to the initial state, waiting for a safe sign of a sentence ending. If a sentence terminator is entered (.?!), we move to state 1 (forgetting everything beforehand). If a white space character is entered, it is ignored, unless we are in state 1, when we proceed to state 2. Letters (converted to upper case) are replaced in the text only if we are in state 2. At other than whitespace characters and terminators (like letters) we move back to the initial state, waiting for the end of another sentence.

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This is wondeful coding Laszlo.
I find this useful.
Oh my ...
Your code also replaces in the next line..

Absolute beauty.. It even replaces with a line in between..

Thanks a lot.
This code will be very useful to me.

Regards, ...

Ps: i never used shift to type this post.

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The code demonstrates the power and simplicity of state machines. Try writing a parser for real numbers with optional sign, decimal point, signed or unsigned exponent. With state machines you might succeed with less than 20 lines of code.

I'm running it right now... And i think its really good and useful... Thanks for sharing it Laszlo!

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You can remove SetBatchLines and Priority and use SendInput instead of Send - it's faster and much less likely to cause system instability.

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SetBatchLines determines how fast the script runs, that is, how often it sleeps. Because the script has an always running loop, it must finish its job fast, otherwise it will miss keys at fast typing. In slower PC's SetBatchLines -1 looks necessary.

Similarly, "Process Priority,,High" ensures that when other tasks consume CPU cycles, this script still reacts to key presses quickly. You should even consider "Realtime", if you experience keys appearing slowly in the application.

Since Send only sends 2 keys in the beginning of sentences, the speed advantage of SendInput is not noticeable. On the other hand, some applications don't take SendInput keys (like my MultiEdit does not like SendInput ^v), so you have to use Send (= SendEvent) or even SendPlay. I found Send is the best tradeoff between compatibility and speed. If it is different in your PC, just change it.

Just a suggestion...

The letter "I" between spaces to be in capital too?

oh anyway.. Mine didnt work properly >.< it wont start with capital unlses i have a "." in front >.< or ! etc..

Not for me! If anyone types program code, math formulae, algorithms, the capitalized variable i drives him crazy. It happens to be the imaginary unit and the most common index variable.
This was the purpose. "If you finish a sentence with ".", "?" or "!" followed by white space or new line, a new sentence follows".

im using it right now and i dont think it is working

im not sure whats wrong maybe its my computer

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Soldier3570

In what application, Windows version, AHK version? What happens if you type ". a"?

Here's a version I use where APPsKEY turns it on or off, as sometimes it is annoying. This also changes apostrophe's and quotations.

Turning it on or off is a good idea! Here is a somewhat simpler version of your variant. (It does not break out at NewInput of the Input command, Ctrl-H, Alt-Tab, etc.)

hi. Im just a beginner and im trying to learn and study your script.

how do i modify the script to capitalize the first letter of every word i type?

Thank you.

Something like this.Don't forget, this is a very simple script: if you move around with the arrow keys, PgDn, End, etc., it cannot tell if at the new caret position a new word starts, or we are in the middle of a word.