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程序员们肯定知道正则表达式，正则语言则属于theoratical computer science，但它没那么难。简单来说，能被正则表达式表示的，就是正则语言。 正面例子就不说了，大家肯定都有概念。我举个反例，什么不是正则语言呢？我用伪正则表达式\eqref{reg-n}来描述，a要重复n次，然后b […]

Half&Half 到底是什么？淡奶油又是什么？快收藏！ 美国奶制品通用手册

2010年左右，我开始使用Evernote。那时候，我用它来记密码、软件注册码，还有一些杂项条目。接着，我渐渐用Evernote“收集”写得好的文章等。如今，我好久好久才会去登录一下Evernote，查看一些以前的东西。为什么我不再用笔记软件了呢？因为没什么东西需要记了。 不上课记笔记 有人需要上课 […]

For anything other than simple substitutions on a single line you should be using awk, not sed. Hold spaces, pattern spaces, and 95% of the sed langua […]

Touch Keyboard and Handwriting Panel Service 如果禁用，将无法使用中文输入法或任何英文以外的输入法。 Microsoft Software Shadow Copy Provider 如果禁用，System Protection里的System Restor […]

String similarity and transformation (Edit Script) A distance of two sequences can be defined, for instance by TLSH. Such a definition may not derive […]

Given two (sets of) objects \(o_1, o_2\), the learn function generates a program p. When given \(o_1\), the program p recovers \(o_2\). When given ano […]

I found a CatchChallenger benchmark performed in year 2012 to 2016[1], where gzip, bzip2, lzma, the extreme option of lzma[1], xz, the extreme option […]

Subversion Subversion (svn) uses a technique called “skip-deltas”. In the FSFS back end, each revision of a file is represented as a delta […]

In Firefox, go to about:config, add key browser.urlbar.update2.engineAliasRefresh to true. Otherwise you can’t manually add search engines or ru […]