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Anchors and boundaries are used in regular expressions to match patterns at specific ___ in the input string. Anchors can be used to match the ___ of a line, while boundaries are used to match the position between a word character and a non-word character. Anchors and boundaries allow for more precise matching and help avoid false positives.

Complete the following statement: Anchors and boundaries are used in regular expressions to match patterns at specific ___ in the input string.