![]() ![]() Can only be used in a bracket expression. Matches one character from a POSIX character class. matches one of 0 through 9 or a through z Reduces the character class to the characters present in both “base” and “intersect”. ] matches a single letter that is not a vowel. Removes all characters in the “subtract” class from the “base” class. ef ] is the same as and matches any letter between a and f. ef] matches aef], bef],, cef], and def]Īn opening square bracket inside a character class begins a nested character class. matches x (any character except a, b, c or d)Īn opening square bracket is a literal character that adds an opening square bracket to the character class. Negates the character class, causing it to match a single character not listed in the character class. In place of character, we can also pass ASCII value as an argument as char to int is. ![]() The method will return true if it is letter ( A-Z, a-z), otherwise return false. boolean isLetter (char ch): This method is used to determine whether the specified char value (ch) is a letter or not. ^ (caret) immediately after the opening [ The methods of Character class are as follows: 1. (hyphen) between two tokens that each specify a single character.Īdds a range of characters to the character class. Unless otherwise noted, the syntax on this page is only valid inside character classes, while the syntax on all other reference pages is not valid inside character classes.Īll characters except the listed special characters are literal characters that add themselves to the character class.Ī backslash escapes special characters to suppress their special meaning.Ī backslash is a literal character that adds a backslash to the character class. ![]() Inside a character class, different rules apply. When used outside a character class, [ begins a character class. Regular Expression Reference: Character Classes ![]()
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