如何使 glob2rx 不添加“^"到正则表达式的开头? [英] How to make glob2rx not add "^" to beginning of regex?

问题描述

我正在使用 glob2rx 将用户输入转换为正则表达式以匹配文本模式.

I am using glob2rx to convert user input into regular expressions to match text patterns.

如果用户输入 run* ，我希望它匹配 runs 以及 running.

If the user inputs run* , I would like it to match runs as well as running.

glob2rx 在构造正则表达式方面效果很好，但它总是在正则表达式的开头添加一个 ^，即它只会匹配字符串开头的项目.但是，我也想匹配字符串中的标记.例如，在下面的例子中，它不匹配 I am running，只有 running am I 因为它返回正则表达式模式 ^run -我希望它创建run.

glob2rx works very well in constructing the regex, but it always adds a ^ to the beginning of the regex, i.e. it will match only items at the beginning of the string. However, I would like to match tokens within the string as well. For instance, in the example below, it does not match I am running, only running am I as it returns the regex pattern ^run - I would like it to create run.

regex = glob2rx("run*")

for (t in c("running am i", "i am running")) {
  print (grep(regex, t))
}

有什么简单的方法可以使这项工作顺利进行吗?

Is there an easy way to make this work?

谢谢！

推荐答案

你可以用 gsub 去掉开头的 ^ :

You can strip off the initial ^ with gsub:

gsub("^\\^", "", glob2rx("run*"))

但是 glob2rx 是为特定类型的输入(文件路径globs")设计的，因此可能会出现其他问题，因为该函数是为该输入设计的.

But glob2rx is designed for a specific kind of input (file path "globs"), so there may be other issues that pop up because the function is designed for that input.

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