RegEx NOT condition explanation and examples
RegEx NOT condition explanation and examples Creating a "NOT" condition in regular expressions can be achieved primarily through two mechanisms: negated character classes and negative lookarounds. 1. Negated Character Classes This method is used to match any single character except those specified within the class. Syntax: [^...] Explanation: The caret ^ at the beginning of a character class [] negates the class, meaning it will match any character that is not present within the brackets. Example: [^aeiou] matches any single character that is not a lowercase vowel. 2. Negative Lookarounds Negative lookarounds are zero-width assertions that check for the absence of a pattern without consuming any characters in the string. a) Negative Lookahead Syntax: (?!pattern) Explanation: This asserts that pattern does not immediately follow the current position. Example: ^(?!word).*$ matches an entire lin...