regex
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Validate Email Address with Java Regular Expression example
Email validation is a very frequent requirement in many applications. Basically the main policy that email format follows is that…
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How To Validate Hex Color Code With Regular Expression
In this tutorial we are going to see how to create a simple application that validates Hexadecimal Color Codes. The…
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Validate Password with Java Regular Expression example
In the previous tutorial on username validation we explained why input validation is important for your application’s security and data…
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Validate Username with Java Regular Expression example
When you are writing an application that requires authentication, in most cases, the users should provide a username among other…
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Simple validation example
In this example we shall show you how to make a simple validation of a String, using a Matcher against…
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Find duplication in strings example
With this example we are going to demonstrate how to find duplication in Strings. In order to check if there…
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Determine if a string matches a pattern exactly
This is an example of how to determine if a String matches to a Pattern exactly. Using a Matcher to…
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Matcher.appendReplacement example – Part 2
In this example we shall show you how to use Matcher.appendReplacement(StringBuffer sb, String replacement) API method to append to a…
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Strip extra spaces in a string
With this example we are going to demonstrate how to strip extra spaces in a String. In short, to strip…
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Simple positive Lookbehind
This is an example of a simple positive look behind. Positive look behind methods assert the existence of a pattern…
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