grep for special characters in Unix
Tell grep to treat your input as fixed string using -F option. Option -n is required to get the line number,
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Finding all possible combinations of numbers to reach a given sum
This problem can be solved with a recursive combinations of all possible sums filtering out those that reach the target. Here is the algorithm in Python: This type of algorithms are very well explained in the following Stanford’s Abstract Programming lecture – this video is very recommendable to understand how recursion works to generate permutations of solutions. … Read more
How to do case insensitive search in Vim
You can use the \c escape sequence anywhere in the pattern. For example: /\ccopyright or /copyright\c or even /copyri\cght To do the inverse (case sensitive matching), use \C (capital C) instead
Finding text inside a folder using terminal
I am trying to find a line of code in a folder and using the terminal. I use this command, which I think should work: where the folder I am inspecting is called “myWordpress”. But I get this: I don’t use much the terminal, so I am unsure as to how to do what I … Read more
How to search through dictionaries?
If you want to know if key is a key in people, you can simply use the expression key in people, as in: And to test if it is not a key in people:
How do you make Vim unhighlight what you searched for?
Just put this in your .vimrc
What is the difference between graph search and tree search?
Judging from the existing answers, there seems to be a lot of confusion about this concept. The Problem Is Always a Graph The distinction between tree search and graph search is not rooted in the fact whether the problem graph is a tree or a general graph. It is always assumed you’re dealing with a … Read more
Search all the occurrences of a string in the entire project in Android Studio
TLDR: ⌃⇧F on MacOS will open “Find in path” dialog. First of all, this IDEA has a nice “Find Usages” command. It can be found in the context menu, when the cursor is on some field, method, etc. It’s context-aware, and as far as I know, is the best way to find class, method or field … Read more
Solr vs. ElasticSearch
Update Now that the question scope has been corrected, I might add something in this regard as well: There are many comparisons between Apache Solr and ElasticSearch available, so I’ll reference those I found most useful myself, i.e. covering the most important aspects: Bob Yoplait already linked kimchy’s answer to ElasticSearch, Sphinx, Lucene, Solr, Xapian. Which fits for which usage?, … Read more
Python list of dictionaries search
Assume I have this: and by searching “Pam” as name, I want to retrieve the related dictionary: {name: “Pam”, age: 7} How to achieve this ?