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Characters that must be escaped
He Diyi edited this page Oct 4, 2019
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Outside of a class, ^$.?*+()[\| must be escaped to be used literally.
Inside of a class, \[]^- must be escaped to be used literally. This deserves a bit of clarification:
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[must be escaped to be used literally because it denotes the start of a set in a class. - Unescaped
]can be used literally when it is placed at the very beginning of a class. - Unescaped
^can be used literally when it is not placed at the beginning of a class. - Unescaped
-can be used literally when it is placed at the beginning or end of a class.
In extended mode, # becomes a metacharacter denoting the start of a comment, so it must be escaped to be used literally.