An expression that regularly matches one of two strings

When you need to match one of multiple strings , Such as ： matching abc|def One of the two strings is captured using a non tuple .

The syntax of non tuple capture is ：

(?:exp)

For example, matching all the pictures in a web page url, And the picture of url Usually, the jpg,png End of equal suffix , The following code demonstrates how to match pictures url

#(?:jpg|png|gif) Match one of the three strings