Learn Java Programming - Regex Boundaries Tutorial
Regex boundaries allow you assert things about where a token can exist in a search string. Let's imagine for a moment that we want to make sure that the first three characters of a string are actually digits followed by a dash(-). We would do this using the caret(^) metacharacter which instructs the regex engine to make sure the token to the right is the first thing in the beginning of a line.
"^(\\d){3}-" · "867-5309" will return TRUE when invoking the .find() method.
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