How can I get the boundaries of a regular expression?

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Lets say I have a string that I need to split into an array based on a pattern. Many language split methods will remove the things matched by the pattern causing a split of a string

testtestt

on the regular expression

.{2}

ending up with a result of

t

This is not the result I wanted so how can I use a regular expression only to capture the borders of what is matched with the same scenario above being matched as

te|st|te|st|t

and as a result being split into an array of

['te','st','te','st','t']

?

Note: This is not language specific and the ideal answer would be a regular expression instead of a piece of code exclusive to certain languages.



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