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In other languages, in RegExp you can use /.../g for a global match.
However, in Ruby:
"hello hello".match /(hello)/ Only captures one hello.
How do I capture all hellos?
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RegExp. prototype. global has the value true if the g flag was used; otherwise, false . The g flag indicates that the regular expression should be tested against all possible matches in a string. Each call to exec() will update its lastIndex property, so that the next call to exec() will start at the next character.
=~ is Ruby's pattern-matching operator. It matches a regular expression on the left to a string on the right. If a match is found, the index of first match in string is returned. If the string cannot be found, nil will be returned.
A regular expression is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings. Ruby regular expressions i.e. Ruby regex for short, helps us to find particular patterns inside a string. Two uses of ruby regex are Validation and Parsing.
To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ). E.g., \. matches "." ; regex \+ matches "+" ; and regex \( matches "(" .
You can use the scan method. The scan method will either give you an array of all the matches or, if you pass it a block, pass each match to the block.
"hello1 hello2".scan(/(hello\d+)/) # => [["hello1"], ["hello2"]] "hello1 hello2".scan(/(hello\d+)/).each do|m| puts m end I've written about this method, you can read about it here near the end of the article.
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