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Java™
by example!
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How do I get started with the 1.4 package regex?
If you have no clue about what regular expressions are, check out Introduction to Regular Expressions by Tom Sgouros.
First, define a regular expression:
Then you can apply that pattern to a sequence of characters (the interface CharSequence, which String, StringBuffer and CharBuffer implement, has been added to JDK1.4.
You can then create a Matcher providing it with a CharSequence to which you want to apply your pattern:
Executing matches() returns true when the whole region matches the pattern. find() returns true when there is a subsequence of the region that matches the pattern. You can find the start and end indexes with start() and end().
For example: MatchString.java:
outputs:
To test out different regular expressions (find a summary of regular-expression constructs in the Javadoc documentation of Pattern), you can use the following example. It prints out a series of matches, given an input file and a regular expression.
Main.java:
Example:
outputs:
Further Information
Author of answer: Joris Van den Bogaert
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