Based on the suggestion here: Find location of character in string, I tried this:
> gregexpr(pattern = ‘$’,”data.frame.name$variable.name”)
[[1]]
[1] 30
attr(,”match.length”)
[1] 0
attr(,”us
Tag: lookup
Regular expression – Search repeated files across multiple directory
I downloaded some files related to a specific topic from the Internet. Now I want to check if there are any duplicates in the files. The problem is that the names of the files will be different, bu
RW_ “Data Structure” 9-10 chapter [internal sort and lookup]
2016.09.03 –09.07
[Personal notes, there may be errors]
The notes about sorting or searching [this time Also]:
[1] Re-set search and sorting
[2] Implementation of internal sorting algori
[Data Structure] Finding of Binary Trees and Calculation of Knights
The previous blog has basically introduced the basic algorithm of the binary tree. This article mainly introduces the search of nodes in the binary tree and the number of subtrees in the Kth row.
Swift protocol with associated type (type lookup is not clear)
I need to create a generic function in the protocol and use the default implementation in the extension. It should use item as an enumeration: RawRepresentable, where RawValue == String always. I t
Ruby – Regular expression, look for strings that include but not starting with strings
I am parsing a text file, traversing each line, and I am having trouble finding regular expressions. Part of this parsing involves changes appearing, for example: & Eacute; and & eacute;