regex negative lookahead

There are four forms of Regular Expressions: (? = Pattern) Assertion (zero-width positive lookahead assertion)(?! Pattern) Assertion (zero-width negative lookahead assertion)(? (? The pattern here is a regular expression. As ^ indicates the

Regular expression 0-wide assertion: 0-wide assertion is a difficult point in regular expressions, so this chapter focuses on the analysis of the matching principle. The 0-wide assertion also has other names, such as "Look Around" or "pre-search,"

What is a regular expression?Regular expressions, also known as formal representations, general representations (English: Regular Expression, often abbreviated as regex, RegExp, or re) in code, are a concept of computer science. A regular expression

(?! = Xxx [: | \ s]?) \ D {16}(?! = Xxx) indicates to search for XXX content, but the final result does not include it(? = Xxx) indicates searching for XXX content. The final result includes[: | \ S]? Full-width colon, half-width colon, space or no

Java Regular ExpressionsThe regular expression defines the pattern of the string.Regular expressions can be used to search, edit, or manipulate text.Regular expressions are not limited to a single language, but have subtle differences in each

Regular expression InstancesA string is actually a simple regular expression, such as the Hello World regular expression that matches the "Hello World" string.The. (dot) is also a regular expression that matches any one of the words such as: "A" or "

The regular expression defines the pattern of the string.Regular expressions can be used to search, edit, or manipulate text.Regular expressions are not limited to a single language, but have subtle differences in each language.Java regular

Java Regular ExpressionsThe regular expression defines the pattern of the string.Regular expressions can be used to search, edit, or manipulate text.Regular expressions are not limited to a single language, but have subtle differences in each

The terminology of regular expressions1) metacharacters: Non-generic characters, characters with a certain meaning. such as: \bx: \b Boundary character, word starting with X2) commonly used:　　\d : Matches a number: \d, matches at least one number \d+

OverviewA regular expression is a powerful string processing tool that enables you to find, extract, split, and replace strings.Several methods of the string class need to rely on support for regular expressions. Method Method