Regular Expression

Regular Expression Supported By : java.util.regex

Introduction & uses ,[object Object],[object Object],[object Object]

Pattern & Matcher Objects ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Performing Pattern Matching

Performing Pattern Matching contd. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Performing Pattern Matching contd. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Metacharacters ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Character Classes ,[object Object],[object Object],a through z, except for b and c: [ad-z] (subtraction) [a-z&&[^bc]] a through z, and not m through p: [a-lq-z] (subtraction) [a-z&&[^m-p]] d,e, or f (intersection) [a-z&&[def]] A through d, or m through p: [a-dm-p] (union) [a-d[m-p]] A through z, or A through Z, inclusive (range) [a-zA-Z] Any character except a,b, or c (negation) [^abc] a,b or c (simple class) [abc] Conditions under which there’ll be a match Regular Expression

Simple Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Negation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Ranges ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Union ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Intersections ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Subtraction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Predefined Character Classes ,[object Object],A non-word character: [^] A word character: [a-zA-Z_0-9] A non-whitespace character: [^] A whitespace character: [0B] A non-digit: [^0-9] A digit: [0-9] Any character . (Dot) Character class Shorthand

Quantifiers ,[object Object],[object Object],[object Object],[object Object],[object Object],X, at least n but not more than m times X{n,m}+ X{n,m}? X{n,m} X,at least n times X{n,}+ X{n,}? X{n,} X, exactly n times X{n}+ X{n}? X{n} X, One or more times X++ X+? X+ X, Zero or more times X*+ X*? X* X,Once or not at all X?+ X?? X? Meaning Possessive Reluctant Greedy

Greedy Quantifiers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Zero-length Matches ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Zero-length Matches contd. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Zero-length Matches contd. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Zero-length Matches contd. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Capturing Groups & Character classes with Quantifiers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Capturing Character classes with Quantifiers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Difference Among Greedy, Reluctant & Possessive Quantifiers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Difference Among Greedy, Reluctant & Possessive Quantifiers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Difference Among Greedy, Reluctant & Possessive Quantifiers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Capturing Groups ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Counting the Capturing Groups ,[object Object],[object Object],[object Object],[object Object],[object Object]

Backreferences ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Boundary Matchers ,[object Object],The end of the input End of the input but for the final terminator, if any End of the previous match Beginning of the input A non-word boundary A word boundary End of a line $ Beginning of a line ^ Meaning Boundary Matchers

Boundary Matchers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Boundary Matchers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Regular Expression

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Regular Expression