正则表达式以匹配IRC昵称 [英] Regular expression to match IRC nickname

问题描述

如何使用正则表达式匹配IRC昵称?这样做是否可以在Ruby中完成(使用regex的语法，也许会，但谁知道.)

How would I use a regular expression to match an IRC nickname? This is being done in Ruby if that makes a difference (it probably will, with the syntax of the regex, but who knows.)

IRC昵称可以包含任何字母，数字或以下任何字符:< - [ ] \ ^ { }

An IRC nickname can contain any letter, number, or any of the following characters: < - [ ] \ ^ { }

推荐答案

# If you are testing a single string
irc_nick_re = /\A[a-z_\-\[\]\\^{}|`][a-z0-9_\-\[\]\\^{}|`]*\z/i 

# If you are scanning them out of a larger string
irc_nick_re = /(?<=[^a-z_\-\[\]\\^{}|`])[a-z_\-\[\]\\^{}|`][a-z0-9_\-\[\]\\^{}|`]*/i 

以上允许单字符名称.如果需要两个字符，请将*更改为+.如果需要三个字符(或更多)，请将其更改为{2,}，其中"2"是最小字符数减去1.

The above allows single-character names. If two characters are required, change the * to +. If three characters (or more) are required, change it to {2,}, where '2' is the minimum number of characters minus 1.

如果最大字符数(例如，EFNet仅允许最多9个字符的昵称，而Freenode最多允许长16个字符的昵称)，则可以在逗号后包括该数字(负1).例如:

If there is a maximum number of characters (for example, EFNet only allows nicknames up to 9 characters lone, while Freenode allows nicks up to 16 characters long) then you can include that number (minus 1) after the comma. For example:

# Validate nicknames that are between 3 and 16 characters long (inclusive)
irc_nick_re = /\A[a-z_\-\[\]\\^{}|`][a-z0-9_\-\[\]\\^{}|`]{2,15}\z/i 

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