The text replacement utility PhraseExpress has several options to avoid unwanted text insertions caused by the Autotext function.
This video will show you some tricks to get the most out of Autotext:
Please learn more in the chapter Autotext of the PhraseExpress manual.
Great tips for autotext completion. Another (3rd) way of doing the same thing and almost as quick is to put a period in from of the autotext. For instance .an would replace the text an would not. In English it is not likely (unless you are a poor typer like me) have a period followed by a lower case letter.
Where did the (tab to execute) come from?
You can configure this hotkey in the settings under “popup” -> “hotkeys”.