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Filter the content of a file using regular expressions

This is an example of how to filter the content of a file using regular expressions. Filtering the content of a file using regular expressions implies that you should: Compile a given String regular expression to a Pattern, using compile(string regex) API method of Pattern. Create a new FileInputStream with a given String path by opening a connection to a ...

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Filter lines from reader example

In this example we shall show you how to filter lines from a Reader. To filter lines from a Reader one should perform the following steps: Create a new BufferedReader that uses a FileReader with a given name of a file to read from. Compile a given String regular expression to a Pattern, using compile(string regex) API method of Pattern. ...

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Line ending matching example

With this example we are going to demonstrate how to check a line ending matching. We are using Patterns and Matchers against each pattern. In short, to check a line ending matching you should: Create a String array that contains the patterns to be used. For every pattern in the array compile it to a Pattern, using compile(string regex) API ...

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Matcher group example – Part 2

This is an example of how to use Matcher.group(int group) API method to get the input subsequence captured by the given group during the previous match operation. Grouping with a Matcher implies that you should: Compile a String regular expression to a Pattern, using compile(String regex) API method of Pattern. Use matcher(CharSequence input) API method of Pattern to create a ...

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Matcher replaceAll – Part 2

In this example we shall show you how to use Matcher.replaceAll(String replacement) API method to replace every subsequence of an input sequence that matches a specified pattern with a given replacement string. To replace any subsequence of a given sequence with a given String one should perform the following steps: Compile a String regular expression to a Pattern, using compile(String ...

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Matcher group with parameter example

With this example we are going to demonstrate how to use Matcher.group(int group) API method to get the input subsequence captured by the given group during the previous match operation. In short, to use group(int group) API method of Matcher you should: Compile a String regular expression to a Pattern, using compile(String regex) API method of Pattern. Use matcher(CharSequence input) ...

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Matcher replaceFirst example

This is an example of how to use Matcher.replaceFirst(String replacement) API method to replace the first subsequence of an input sequence that matches a specified pattern with a given replacement string. Replacing the first subsequence of a String input with a given string using a Matcher implies that you should: Compile a String regular expression to a Pattern, using compile(String ...

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Matcher replaceAll example

In this example we shall show you how to use Matcher.replaceAll(String replacement) API method to replace every subsequence of an input sequence that matches a specified pattern with a given replacement string. To replace any subsequence of a given sequence with a given String one should perform the following steps: Compile a String regular expression to a Pattern, using compile(String ...

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Matcher lookingAt example

With this example we are going to demonstrate how to use Matcher.lookingAt() API method to match an input sequence, starting at the beginning of the input, against a specified pattern. In short, to match a Sting input against a pattern with Matcher.lookingAt() API method you should: Compile a String regular expression to a Pattern, using compile(String regex) API method of ...

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Matcher match example

This is an example of how to make a match using a Matcher against a Pattern. Making a match using a Matcher against a pattern implies that you should: Compile a String regular expression to a Pattern, using compile(String regex) API method of Pattern. Use matcher(CharSequence input) API method of Pattern to create a Matcher that will match given String ...

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