Substitute Strings in Files with Ruby

Uses a list of regular expressions and replacement strings to make changes in text files.

Put in file "edit-all.rb" and run with

ruby edit-all.rb *.txt

Now accepts the target and the replacement from the command line or from the keyboard.

Ruby CSV to XML Converter

This code will take an input CSV file and output XML. IT was easy to write, but I haven't found anything out there to do this. The first line of the CSV file should contain the element names.

RSS Twitter Bot with Ruby

A short Ruby script that will read an RSS feed and republish it to your Twitter account. This could be useful for livestreaming or getting some sort of commercial presence on there.

Ruby: Pronounceable Random Password Generator

This piece of code generates a random password of the specified length, but mixes the two sets of letters so that a pronouncable password is being generated.

Ruby: Extract Age from Birth Date

A Ruby function for extracting one's age by passing in the birth date as a parameter.

Python: Check Credit Card "checksum"

The CardChecksum function returns 1 for valid cards and 0 for invalid cards, after performing a check using the Luhn algorithm which validates all major credit cards.

Python: Find the Greatest Common Divisor

Implement the Euclidean algorithm into a Python function in order to calculate the largest common divisor of two numbers.

Ruby: Write A PDF File Using Ruby

Using the open source PDF::Writer library for Ruby to create PDF documents on the fly and save them on the server.

Ruby: Extended Euclidean Algorithm Function

A function for finding the modular multiplicative inverse, based on an extended version of the Euclidean algorithm.

Ruby: Strip HTML tags using Ruby

The StripHtml function strips all the HTML tags in the passed string but preserves the ones specified in the PreserveTags array.

Ruby: Check if an URL is available

This little Ruby function will check if an URL is available (response code 200). It will return true if the return code is 200 (success), false if any other code is returned, such as 404 (not found.)

Ruby: Mask all Credit Card Digits but Last Four

Mask all the credit card number digits with asterisks except the last 4, for security purposes. The function works for all types of cards (Visa, MasterCard, Amex, Discovery, etc.)