Java Regular Expression Foundation

This lecture will introduce basic syntax in regular expressions. You need to know those basic syntax before going further in other lectures.

This lecture will show you how to validate simple user's inputs such as number, numbers with fixed number of digits, word characters, and letters in combination with digits.

This lecture will show you how to validate patterns with digits and characters in certain ranges, or with particular characters using custom character class. You'll also learn how to restrict the minimum and maximum number of characters inputted from users

You will learn how to use regular expressions to validate simple phone number format and email address format. You'll also learn a basic grouping technique to make the phone format validation a bit more flexible.

I will discuss about basic grouping techniques in Java regular expression so that you can use to force users to input items that should be in a predefined list. You'll also learn how to use grouping technique to validate a date format.

I will discuss about the 2 popular methods in Java that can be used to replace sub-strings in a string: replace() and replaceAll()

In this lecture, you will learn how to extract sub-strings from a text based on regular expression patterns with the Scanner class. You'll also learn how to use the Scanner class to read data from a variable and a text file. This is one of the most important skills when working with string in Java.

You'll learn another way to extract sub-string from a text by using the StringTokenizer class. You'll also see the differences between the Scanner class and the StringTokenizer class. Those differences are very important.

You'll learn another way to slit sub-string from a text using the split() method in the String class. And of course, you'll learn the differences between this method and the Scanner/StringTokenizer class.

This lecture will show you how to use the very powerful and flexible regular expression engine in Java: the package java.util.regex.*. You'll learn how to use the most popular and important methods: matches(), lookingAt(), and the find() method. You need to master these skills before processing in other advanced topics in regular expression.

This lecture will go into more details about groups and sub-groups. These concepts are one of the fundamentals in regular expressions. With groups and sub-groups, you'll know how to separate a string into sections and extract those section data when you see fit.

This lecture will discuss about boundary meta characters in regular expression. Meta characters are used very frequently in some searching features in many applications such as finding "a whole word" and finding at the beginning of the text.

This lecture show you another advanced technique in regular expression: backreferences. These techniques can be used to find repeated words or data in a string.

This lecture will help you to understand the concept look-ahead which is used very often in regular expressions. This technique can be used to improve the expression pattern checking process.

This lecture will help you to understand the other type of look-ahead: negative look-ahead which can be applied to filter content from certain text.

The concept of positive look-behind will be covered in this lecture which can be used to check if a text is preceded by another text, which is one of the common tasks while working with string.

This lecture will help you to understand the negative look-behind concept which works in the opposite way to the positive look-behind, in which you can use to check if a text is NOT preceded by a certain text pattern.

This lecture will show you other very important concepts in regular expression: Greedy and Quantifiers. Mastering these concepts will help you to design very flexible expression patterns.

The final lecture and also very important one: you will learn the possessive quantifiers and how these techniques affect the performance as well as the matching results of a certain expression pattern.