regular expression\aboutFile.java
..................\ArrayStack.java
..................\arrow.jpg
..................\baby.gif
..................\discussion.java
..................\exitApps.java
..................\fromInfix.java
..................\fromPost.java
..................\fromPre.java
..................\howToUse.java
..................\index.java
..................\infixToPostfix.java
..................\infixToPrefix.java
..................\javalogo.gif
..................\postfixConverter.java
..................\prefixConverter.java
..................\progressbar.jpg
..................\Project.java
..................\stack.java
regular expression