如何匹配Perl中的重复字符？ [英] How to match repeat characters in Perl?

问题描述

您好，


我是Perl的新手，我正在逐步完成在线教程。我正在尝试计算文件中包含双字母字符串的行。这是我的代码 -

Hello,

I''m new to Perl and I''m stepping through an online tutorial. I''m trying to count the lines in a file that have strings with double letters in them. This is my code -

展开 | 选择 | Wrap | 行号

推荐答案

您好，


我是Perl的新手，我正在逐步完成在线教程。我正在尝试计算文件中包含双字母字符串的行。这是我的代码 -

Hello,

I''m new to Perl and I''m stepping through an online tutorial. I''m trying to count the lines in a file that have strings with double letters in them. This is my code -

展开 | 选择 | Wrap | 行号

。+将匹配行中任何一个或多个字符。它不会匹配相同的重复字符。为此您将使用：


/(.)\1/


或者如果您只想计算重复的单词字符


/（\ w）\1 /


发布您正在使用的在线教程的链接。

.+ would match one or more of any character in the lines. It will not match repeated characters that are the same. For that you would use:

/(.)\1/

or if you only want to count repeated word characters

/(\w)\1/

post a link to the online tutorial you are using.

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