从开始或结束修剪Dart字符串中的空格 [英] Trimming whitespace in Dart strings from beginning or end

问题描述

我是Dart的新手，我试图得到一些基本的图书馆的感觉。对于字符串，提供了一个trim（）函数。这是好的，但没有明显的方法来修剪空格只在开始或只是在字符串的结尾？我找不到他们。谢谢你。

I am very new to Dart and am trying to get some sense of the basic libraries. For strings, there is a trim() function provided. This is good, but are there no obvious ways to trim whitespace only at the beginning or only at the end of a string? I cannot find them.Thank you.

推荐答案

没有特定的方法只修剪前导或尾随空格。但它很容易实现它们：

There are no specific methods for trimming only leading or trailing whitespace. But it is quite easy to implement them:

/// trims leading whitespace
String ltrim(String str) {
  return str.replaceFirst(new RegExp(r"^\s+"), "");
}

/// trims trailing whitespace
String rtrim(String str) {
  return str.replaceFirst(new RegExp(r"\s+$"), "");
}

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