Ruby has a built-in support for regular expressions too. From another point of view, regular expression syntax constitutes a domain specific language for matching text. A pattern is a regular expression that defines the text we are searching for or manipulating. It consists of text literals and...
Ruby regular expressions are defined between two forward slashesto differentiate them from other language syntax. The most simple expressions match a word or even a single letter. For example: # Find the word 'like' "Do you like cats?" =~ /like/ This returns the index of the first occurre...
Detailed help on that syntax is always only a click away. If you copied a regex written for another programming language, simply paste it into RegexBuddy, select the original language, and then convert the regex to the specific version of Ruby you’re using. If you’re developing a Ruby ...
, and + operators. Al Aho's egrep, which first appeared in the Seventh Edition (1979), was the first Unix tool to provide the full regular expression syntax, using a precomputed DFA. By the Eighth Edition (1985), egrep computed the DFA on the fly, like the implementation given above. ...
ExpressionResultDescription /a/ =~ "All Gaul is divided into three parts" 5 finds the first "a" at position 5 %r{a} =~ "All Gaul is divided into three parts" 5 same thing with alternate syntax /ree/ =~ "All Gaul is divided into three parts" 27 finds "ree" at position 27 /^a...
While re2 uses the same naming scheme as Ruby's built-in regular expression library (withRegexpandMatchData), its API is slightly different: Compiling regular expressions Warning RE2's regular expression syntax differs from PCRE and Ruby's built-inRegexplibrary, see theofficial syntax pagefor ...
The\g<name>syntax matches the previous subexpression namedname, which can be a group name or number, again. This differs from backreferences in that it re-executes the group rather than simply trying to re-match the same text. This pattern matches a(character and assigns it to theparengroup...
As I wrote earlier, regular expressions constitute a whole new syntax to memorize. It can seem overwhelming at first. However, it is just a matter of memorization. On the whole, regexes are pretty straightforward to compose, even if they appear to be a long jumble of symbols. ...
Ruby编程语言教程（Tutorials Point）说明书
Ruby 是面向表达的语言(expression-oriented)。您可以像说话一样很容易写出 x = if a<0 then b else c end 这样的句子。 Ruby 语言中系结了 syntax sugar(语法糖)。(转述 Mary Poppins 的话说就是:一勺语法糖可以压一压语义的药味。"A spoonful of syntax sugar helps the semantic medicine go down.")...