use parentheses to group terms within a regular expression : Regexps Group « Development « Ruby






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  3. Regexps Group

use parentheses to group terms within a regular expression

# Everything within the group is treated as a single regular expression. 

def show_regexp(a, re) 
    if a =~ re 
        "#{$`}<<#{$&}>>#{$'}" 
    else 
        "no match" 
    end 
end 
show_regexp('banana', /an*/) # b<<an>>ana 
show_regexp('banana', /(an)*/) # <<>>banana 
show_regexp('banana', /(an)+/) # b<<anan>>a








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