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How to calculate the closest point on a segment to a point

Jun 6, 2010 · 3 min read · c++ programming geometry snippet ·

Hi, below there is a little snippet that calculates the closest point on a segment to a determined point. It is written in C++ but can be easily translated to any other language. Disclaimer: given its age, it uses hungarian notation, and some names are in Spanish, but it was thoroughly tested and works as expected. …

How to replace a substring using regex in Python

Jun 6, 2010 · 1 min read · regular expressions programming python snippet ·

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The problem: You match a string with your regex, but you need to replace just a portion of it. How can we do this? The trick is simple, put the text you want to replace within “()” which means “group” in regex language. If the regex works, you can replace just that portion by using Python match information, like in the …

Multiline regex pattern

May 6, 2010 · 4 min read · regular expressions c# programming python snippet ·

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1 Task: Parse a file and capture whatever text appears between a pair of double quotes like the following: “Catch me” Not so difficult, you could use the following regex: 1“.*” This will match any character within double quotes in a group ¿any? Well, if you have to deal with multi-line characters (CR / LF) like in the …