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This article mainly introduces what is the difference between Ruby regular expression and Perl. It is very detailed and has a certain reference value. Friends who are interested must read it!

Although Ruby is a relatively new programming language, it still has many similarities with other languages. For example, when it comes to Ruby regular expressions, it's almost the same as Perl.

Backquote: -) I don't know how to translate it, so ask Rufas (Ruby Fans) to forgive me for borrowing the noun Perl.

A reverse reference is a reference to a pattern enclosed in parentheses in a Ruby regular expression. The pattern of the following two lines is the same, except that the second sentence is in the form of a back reference.

Pat1 = / ([\ d\ w])-([\ d\ w]) / pat2 = / ([\ d\ w]) -\ 1 /

The thing to note about Ruby regular expressions is that the parentheses of the backreference must be to the left of the reference position. In addition, if you want to match a number immediately after a backreference, you must enclose the backreference expression.

Pat1 = / ([\ d\ w])-(\ 1) 0 / pat2 = / ([\ d\ w]) -\ 10 / # 0 print pat1 = ~ "1-10" # nil print pat2 = ~ "1-10" above are all the contents of the article "what's the difference between Ruby regular expressions and Perl". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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