Java regular expression properties file

Hi, In this below code I am trying to read the file and then use the pattern to but when using the matcher the output is not coming according to pattern used instead output is coming as the text in the text file import java. File; import java.

FileReader; import java. Carey Brown. Saloon Keeper. First off, if you want people to spend the effort to answer your question, put some effort into cleaning up your code i. You may also find your problem that way hint, line I think you need to start over, there are a number of errors in the code, such as reading in the text but doing nothing more that printing it out.

This is the thing I am asking that how to how to use the regex while reading from file so that data in file can be searched in file import java. Winston Gutkowski. Upanshu, Please read the posts of others before you reply.

You were asked politely to clean up your indenting, but your next post is even worse than your first. As Carey already said, you will get more responses if you take the time to clean up your code before you post you can use the 'Edit' button to do this now that you have. It makes your posts very hard to read. Yours are OK so far, but the excessive indenting doesn't help. Flags in the compile method change how the search is performed. Here are a few of them:. The first parameter of the Pattern.

It describes what is being searched for. In Java, backslashes in strings need to be escaped themselves, so two backslashes are needed to escape special characters. We just launched W3Schools videos. Get certified by completing a course today! If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:. Example Find out if there are any occurrences of the word "w3schools" in a sentence: import java.

Matcher; import java. They can be used to search, edit, or manipulate text and data. The Pattern class provides no public constructors. To create a pattern, you must first invoke one of its public static compile methods, which will then return a Pattern object. These methods accept a regular expression as the first argument. Like the Pattern class, Matcher defines no public constructors. You obtain a Matcher object by invoking the matcher method on a Pattern object.

Capturing groups are a way to treat multiple characters as a single unit. They are created by placing the characters to be grouped inside a set of parentheses. For example, the regular expression dog creates a single group containing the letters "d", "o", and "g". Capturing groups are numbered by counting their opening parentheses from the left to the right.

To find out how many groups are present in the expression, call the groupCount method on a matcher object. The groupCount method returns an int showing the number of capturing groups present in the matcher's pattern. There is also a special group, group 0, which always represents the entire expression. This group is not included in the total reported by groupCount. Returns the start index of the subsequence captured by the given group during the previous match operation. Returns the offset after the last character of the subsequence captured by the given group during the previous match operation.

Attempts to match the input sequence, starting at the beginning of the region, against the pattern. Resets this matcher and then attempts to find the next subsequence of the input sequence that matches the pattern, starting at the specified index.