红宝石运算符"=〜" [英] ruby operator "=~"

问题描述

在ruby中，我读了一些运算符，但是找不到=~. =~是什么意思?我看到的程序有

In ruby, I read some of the operators, but I couldn't find =~. What is =~ for, or what does it mean? The program that I saw has

regexs = (/\d+/)
a = somestring
if a =~ regexs

我认为它正在比较somestring是否等于数字，但是还有其他用法吗?=~运算符的正确定义是什么?

I think it was comparing if somestring equal to digits but, is there any other usage, and what is the proper definition of the =~ operator?

推荐答案

=~运算符将正则表达式与字符串进行匹配，如果找到匹配项，则返回该匹配项与字符串的偏移量，否则返回nil.

The =~ operator matches the regular expression against a string, and it returns either the offset of the match from the string if it is found, otherwise nil.

/mi/ =~ "hi mike" # => 3 
"hi mike" =~ /mi/ # => 3 

"mike" =~ /ruby/ # => nil 

您可以将字符串/正则表达式放在运算符的两侧，如上所示.

You can place the string/regex on either side of the operator as you can see above.

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