HDFS-13016. globStatus javadoc refers to glob pattern as "regular expression". Contributed by Mukul Kumar Singh.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileContext.java

@@ -2012,7 +2012,7 @@ public class FileContext {
      *  </dd>
      * </dl>
      *
-     * @param pathPattern a regular expression specifying a pth pattern
+     * @param pathPattern a glob specifying a path pattern
      *
      * @return an array of paths that match the path pattern
      *
@@ -2040,7 +2040,7 @@ public class FileContext {
      * Return null if pathPattern has no glob and the path does not exist.
      * Return an empty array if pathPattern has a glob and no path matches it. 
      * 
-     * @param pathPattern regular expression specifying the path pattern
+     * @param pathPattern glob specifying the path pattern
      * @param filter user-supplied path filter
      *
      * @return an array of FileStatus objects

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java

@@ -2058,7 +2058,7 @@ public abstract class FileSystem extends Configured implements Closeable {
    *  </dd>
    * </dl>
    *
-   * @param pathPattern a regular expression specifying a pth pattern
+   * @param pathPattern a glob specifying a path pattern
 
    * @return an array of paths that match the path pattern
    * @throws IOException IO failure
@@ -2072,7 +2072,7 @@ public abstract class FileSystem extends Configured implements Closeable {
    * {@code pathPattern} and is accepted by the user-supplied path filter.
    * Results are sorted by their path names.
    *
-   * @param pathPattern a regular expression specifying the path pattern
+   * @param pathPattern a glob specifying the path pattern
    * @param filter a user-supplied path filter
    * @return null if {@code pathPattern} has no glob and the path does not exist
    *         an empty array if {@code pathPattern} has a glob and no path