分解 R 中的长正则表达式 [英] breaking up a long regular expression in R

问题描述

问题:我正在使用 R 和 stringr，我有一个很长的正则表达式，使用或"运算符，我将其保存到对象并与 stringr 一起使用.如何在 R 中将其分解为多行，这样我就不必在源代码编辑器中继续向右滚动?当我尝试使用逗号时，只能识别第一行.这个问题的大多数答案都是针对其他编程语言(即不是 R)的.

Problem: I am using R and stringr and I have a very long regular expression using the "or" operator that I save to an object and use with stringr. How can I break it up into multiple lines in R so I do not have to keep scrolling to the right in my source editor? When I try commas, only the first line is recognized. Most answers to this question have been for other programming languages (i.e. not R).

regex_of_sites <- "side|southeast|north|computer|engineer|first|south|pharm|left|southwest|level|second|thirteenth"

推荐答案

正则表达式只是一个字符串.您可以像任何其他字符串一样将其粘贴到多行中

The regular expression is just a string. You can paste it together across multiple lines like any other string

regex_of_sites <- paste0("side|southeast|north|computer|engineer|",
     "first|south|pharm|left|southwest|",
     "level|second|thirteenth")

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