如何使用foreach使用正则表达式 [英] How to use foreach for using regexp

问题描述

我正在使用下面的代码来搜索特定的数据并将其存储在一个变量中。
$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $

这里的名字是有很多数据的变量。我得到一个错误说：错误：无效的命令名称1。我是tcl的新手，所以我无法弄清楚什么是错的。是我的代码是否正确，它的工作？谢谢

解决方案

您的正则表达式正在评估第一个和 regexp {[cell] +} $ search match 返回 1 ，然后变成：



  [ 1] 
  

这是一个无效的命令，删除方括号：



  regexp {[cell] +} $ search match 
  

现在，我不认为你正确地使用正则表达式，它会查找任何组合 c ， e 和 l 至少一次，意味着它会接受 cell ， lec 甚至是 c 你可能想要：



  regexp {（（？：cell）+）} $匹配的匹配
  

这将匹配 cell ， cellcell ， cellcellcell 等等，并把它存储在变量匹配中。

括号用于捕获匹配的组;这些（?: ...）是用于非捕获组的。

编辑：

  set newlist [list] 
 
 foreach搜索$ names {
 regexp {cell \s * \（（[^] +）\）} $ search匹配
 lappend $ newlist $匹配
} 
  

现在，$ newlist列表包含所有匹配的值，您可以执行foreach显示所有他们;

  foreach n $ newlist {puts $ n} 
  

I am using the following code to search for a particular data and store it in a variable.

foreach searched $names {
  [regexp {[cell]+} $searched match]
}

Here names is the variable which has many data. I am getting an error saying: Error: invalid command name "1. I am new to tcl so I cant figure out whats wrong. Is my code correct, will it work? Thanks

解决方案

Your regexp is evaluating first and regexp {[cell]+} $searched match returns 1, which then becomes:

[1]

Which is an invalid command. Remove the square brackets:

regexp {[cell]+} $searched match

Now, I don't think you're using the regexp correctly. This will look for any of the combinations c, e and l at least one time, meaning it'll accept cell, lec or even c alone. You probably want:

regexp {((?:cell)+)} $searched match matched

This will match cell, cellcell, cellcellcell and so on and store it in the variable matched.

Brackets are used to capture matching groups; and these (?: ...) are for non capturing groups.

EDIT: Following on my comment, I would do something like:

set newlist [list]

foreach searched $names {
  regexp {cell\s*\("([^"]+)"\)} $searched match matched
  lappend $newlist $matched
}

Now, the list $newlist contains all the matched values. You can do a foreach to display all of them;

foreach n $newlist {puts $n}

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