Step 1: Compile a regex via static method pile(), default is case-sensitive Input String for matching the regex pattern These are 33 (thirty-three) apples.", you wish to find all occurrences of pattern "Th" (either case-sensitive or case-insensitive). Java Regex by Examples Example: Find Textįor example, given the input "This is an apple. Matcher.end() : returns the offset after the last character matched.Ĭheck out the JavaDoc for Package. Matcher.start() : returns the start index of the previous match. oup() : returns the input subsequence matched by the previous match. Matcher.replaceFirst(replacementStr): Find and replace the first match. Matcher.replaceAll(replacementStr): Find and replace all matches. Matcher.lookingAt() : attempts to match the input sequence, starting at the beginning, against the pattern. Matcher.matches() : attempts to match the entire input sequence Matcher.find() : scans the input sequence looking for the next subsequence that matches the pattern Step 3: Perform the matching and process the matching result // Perform matching operations using: Matcher matcher = pattern.matcher(inputStr) Step 2: Allocate a matching engine for the regex pattern bind with the input string String inputStr = "." // Input for matching, any CharSequence such as String, StringBuffer, StringBuilder, CharBuffer // Step 1: Compile a Regex String into a Pattern object : an engine that performs matching operations on an input CharSequence (such as String, StringBuffer, StringBuilder, CharBuffer, Segment) by interpreting a pattern.You can get a Pattern object via static method pile(String regexStr). : represents a compiled regular expression.Regular expression was introduced in Java 1.4 in package. JavaDoc for Class, which summarizes of the regex patterns.The Online Java Tutorial Trail on " Regular Expressions".I assume that you are familiar with regex and Java. Regular Expression (regex) is extremely useful in programming, especially in processing text files.
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