Questions tagged [pattern-matching]

For challenges about matching a particular pattern or patterns.

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20
votes
6answers
2k views

The matrix has U

Given a matrix of size at least 3×3 formed by positive integers, determine if it contains at least one "U" pattern, defined as ...
-1
votes
1answer
135 views

Symbol Search Deleter [rephrased] [closed]

Your challenge is to parse nonsensical text and output a "congruous phrase" - which I shall define here to be text with any contiguous characters in between, and including, a given set of like symbols ...
14
votes
23answers
4k views

Making Sandwiches

Introduction Bob runs a deli. His deli serves sandwiches to its customers. However, it is a bit unusual. At Bob's deli, instead of telling Bob what they want, customers show Bob an ASCII art drawing ...
19
votes
4answers
857 views

Pentomino 6x10 solution normalizer

As you most probably now, there are 2339 solutions to pentomino puzzle in a 6x10 grid. There are different labeling schemes for the 12 pentominoes, two of them are shown on the image below: Image ...
36
votes
28answers
11k views

Java is to JavaScript as Car is to Carpet

Title stolen inspired by Greg Hewgill's answer to What's the difference between JavaScript and Java? Introduction Java and JavaScript are commonly used languages among programmers, and are currently ...
347
votes
1answer
110k views

Regex that only matches itself

There are some pretty cool challenges out there involving regex (Self-matching regex, Regex validating regex) This may well be impossible, but is there a regex that will ONLY match itself? NOTE, ...