![]() ![]() This regex does not match 44 sheets of a4. Since digits are considered to be word characters, \b 4 \b can be used to match a 4 that is not part of a larger number. ![]() Using only one operator makes things easier for you. This is because any position between characters can never be both at the start and at the end of a word. Most flavors, except the ones discussed below, have only one metacharacter that matches both before a word and after a word. Java supports Unicode for \b but not for \w. ![]() In most flavors, characters that are matched by the short-hand character class \w are the characters that are treated as word characters by word boundaries. All characters that are not “word characters” are “non-word characters”.Įxactly which characters are word characters depends on the regex flavor you’re working with. A “word character” is a character that can be used to form words. Simply put: \b allows you to perform a “whole words only” search using a regular expression in the form of \b word \b. Between two characters in the string, where one is a word character and the other is not a word character.After the last character in the string, if the last character is a word character.Before the first character in the string, if the first character is a word character.There are three different positions that qualify as word boundaries: It matches at a position that is called a “word boundary”. The metacharacter \b is an anchor like the caret and the dollar sign. ![]()
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