正则表达式是一种被用于从文本中检索符合某些特定模式的文本。 正则表达式是从左到右来匹配一个字符串的。“Regular Expression”这个词太长了，我们通常使用它的缩写“regex”或者“regexp”。 正则表达式可以被用来替换字符串中的文本、验证表单、基于模式匹配从一个字符串中提取字符串等等 ...

This Microsoft PowerPoint Presentation Tutorial is a detailed guide for beginners that includes all the basic features & tips required to create a PPT.

The stretches described here can help you prevent shin splints. And, if you have shin splint pain, they'll help you recover. We also give you some prevention and recovery tips from an expert.

Adobe Photoshop Tutorials offers video and text-based learning from the makers of the software - and it's easily one of the best free Photoshop courses online for beginners.