弗雷格的正則表達式文字

Question

在Frege中用於指定正則表達式文字的重音符號的unicode代碼是什么？

Answer 1

該字符稱為“ 急性口音” ，其Unicode為00B4 。 在ubuntu中，您可以使用Ctrl + Shift + u鍵入該00B4 ，然后鍵入00B4然后輸入space 。 但是，如果您的正則表達式文字不止一個字符，則不必真正使用該字符，在這種情況下，您只需使用撇號即可。

引用文檔 ：

Regular expression literals have type Regex and are written:

 ´\b(foo|bar)\b´       -- string enclosed in grave accents
 '\w+'                 -- string with length > 1 enclosed in apostrophes
The notation with the apostrophes has been introduced because many have a hard time entering a grave accent mark on their terminal. However, it is not possible to write a regular expressions with length 1 this way, because then the literal gets interpreted as Char literal. (One can write something like '(?:X)' for a Regex that matches a single 'X').