org.apache.commons.io.filefilter

Class RegexFileFilter

  • All Implemented Interfaces:
    FileFilter, FilenameFilter, Serializable, IOFileFilter


    public class RegexFileFilterextends AbstractFileFilterimplements Serializable
    Filters files using supplied regular expression(s).

    See java.util.regex.Pattern for regex matching rules

    e.g.

     File dir = new File("."); FileFilter fileFilter = new RegexFileFilter("^.*[tT]est(-\\d+)?\\.java$"); File[] files = dir.listFiles(fileFilter); for (int i = 0; i < files.length; i++) {   System.out.println(files[i]); } 

    Since:
    1.4
    Version:
    $Id: RegexFileFilter.java 1642757 2014-12-01 21:09:30Z sebb $
    See Also:
    Serialized Form
    • Constructor Detail

      • RegexFileFilter

        public RegexFileFilter(String pattern)
        Construct a new regular expression filter.
        Parameters:
        pattern - regular string expression to match
        Throws:
        IllegalArgumentException - if the pattern is null
      • RegexFileFilter

        public RegexFileFilter(String pattern,               IOCase caseSensitivity)
        Construct a new regular expression filter with the specified flags case sensitivity.
        Parameters:
        pattern - regular string expression to match
        caseSensitivity - how to handle case sensitivity, null means case-sensitive
        Throws:
        IllegalArgumentException - if the pattern is null
      • RegexFileFilter

        public RegexFileFilter(String pattern,               int flags)
        Construct a new regular expression filter with the specified flags.
        Parameters:
        pattern - regular string expression to match
        flags - pattern flags - e.g. Pattern.CASE_INSENSITIVE
        Throws:
        IllegalArgumentException - if the pattern is null
      • RegexFileFilter

        public RegexFileFilter(Pattern pattern)
        Construct a new regular expression filter for a compiled regular expression
        Parameters:
        pattern - regular expression to match
        Throws:
        IllegalArgumentException - if the pattern is null
    • Method Detail

      • accept

        public boolean accept(File dir,             String name)
        Checks to see if the filename matches one of the regular expressions.
        Specified by:
        accept in interface FilenameFilter
        Specified by:
        accept in interface IOFileFilter
        Overrides:
        accept in class AbstractFileFilter
        Parameters:
        dir - the file directory (ignored)
        name - the filename
        Returns:
        true if the filename matches one of the regular expressions

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