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Unlike in regular expressions, there is no backtracking in PEG.js expressions.

For example, using the input "hi!":

// This will fail
HI = "hi" / "hi!"

// This will pass
HI = "hi!" / "hi"

// This will also pass
HI = w:"hi" !"!" { return w } / "hi!"

For more information on backtracking in PEG.js, checkout this excellent answer on Stack Overflow.