java.util.regex

1. Match Exactly 3 Occurrences Using {n} This program demonstrates the {n} quantifier in Java regular expressions. The {n} matches exactly n occurrences of the preceding character or group. Here, {3} matches exactly three consecutive occurrences of the character a. 2. Match Exactly 2 Digits Using {n} This program uses {2} to match exactly two […]

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1. Match Between 2 and 4 Occurrences Using {n,m} This program demonstrates the {n,m} quantifier in Java regular expressions. The {n,m} matches at least n and at most m occurrences of the preceding character or group. Here, {2,4} matches between two and four consecutive a characters. 2. Match Between 2 and 3 Digits Using {n,m}

1. Match Digits Using Character Class and Quantifier This program uses the character class \d to match digits. The + quantifier matches one or more consecutive digits. It finds and displays all numbers present in the input. 2. Match Letters Using Character Class and Quantifier This program uses [a-zA-Z] to match English alphabetic characters. The

java.util.regex.Matcher is a class used to perform matching operations on text using a Pattern. It checks whether text matches a regular expression and can also find matching portions of text. Matcher is commonly used for validation, searching, extracting, and replacing text. It works closely with the Pattern class in the java.util.regex package. Important Features: Checks

1. Match Zero or One Occurrence Using ? This program demonstrates the ? quantifier in Java regular expressions. The ? matches zero or one occurrence of the preceding character or group. It matches the character when it is present but does not require it. 2. Match an Optional Character Using ? This program uses ?

1. Match One or More Occurrences Using + This program demonstrates the + quantifier in Java regular expressions. The + matches one or more consecutive occurrences of the preceding character or group. Unlike *, it does not match when the character occurs zero times. 2. Match Repeated Characters Using + This program uses + to

1. Match Zero or More Occurrences Using * This program demonstrates the * quantifier in Java regular expressions. The * matches zero or more occurrences of the preceding character or group. It can match the character even when it occurs zero times. 2. Match Repeated Characters Using * This program uses * to find zero

1. Match Any Single Character Using . This program demonstrates the dot (.) metacharacter in Java regular expressions. The . matches any single character except a newline. It finds and displays each character matched by the pattern. 2. Match Characters in a Sentence Using . This program uses . to match every character in a