【Python】Regular expression

Definition:

Regular Expression(RE) in a programming language is a special text string used for a search pattern. It extremely useful for extracting information from text.

Applied instance:

数据验证：查看字符串内是否出现电话号码模式或信用卡号码模式。

Language:

python, java, C#

Reference:

https://www.runoob.com/regexp/regexp-tutorial.html