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Regular expression tester
This online calculator allows user to experiment with regular expressions.
Email extractor
This online calculator parses emails from block of text using regular expression
Select a phone number from the text
This calculator uses regular expressions to select phone numbers from a large block of text
Hack
Hack the three-digit code
Tips and tricks #1: How to set output value
This article describes process of calculator creation and how to set output value.
Tips and tricks #2: How to make calculator translatable into different languages
This article describes the process of adding translation support to the calculator, so it can be translated into different languages.
Tips and tricks #3: How to make calculator with custom errors
This article describes the process of adding custom errors to the calculator
Tips and tricks #4: How to make calculator with table output
This article describes how to make calculator which outputs results in table format
Tips and tricks #5: How to show/hide input and output controls in a calculator
This article describes how to control visibility of input and output controls in a calculator
Tips and tricks #6: How to make calculator with virtual keyboard
This article describes how to create calculator with virtual keyboard using SVG image
Tips and tricks #7: How to make calculator with SVG image map
This article describes how to create calculator with image map using SVG image
Map of France regions
Simple image map of France regions to illustrate usage of SVG image maps
Tips and tricks #8: How to reuse existing calculator
This article describes process of reusing another calculator's logic (algorithm) in your calculator.
Date to timestamp converter
This calculator converts the date to epoch timestamp in milliseconds, that is, milliseconds since standard epoch of 1/1/1970, as used, for example, in JavaScript.
Tips and tricks #9: Big numbers
How to use big number input and PCR library.
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