How to detect this unprintable character using regex or other ways in Ruby? -

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i came upon strange character (using nokogiri).

irb(main):081:0> sss.dump => "\"\\u{a0}\"" irb(main):082:0> puts sss   => nil  irb(main):083:0> sss  => " "  irb(main):084:0> sss =~ /\s/ => nil  irb(main):085:0> sss =~ /[[:print:]]/ => 0 irb(main):087:0> sss == ' '  => false irb(main):088:0> sss.length => 1

any idea strange character?

when it's displayed in webpage, it's white space, doesn't match whitespace \s using regular expression. ruby thinks it's printable character!

how detect characters , exclude them or flag them whitespace (if possible)?

thanks

it's non-breaking space. in html, it's used pretty , written  . 1 way find out identity of character "\u{a0}" search web u+00a0 (using 4 or more hexadecimal digits) because that's how unicode specification notates unicode code points.

the non-breaking space , other things included in regex /[[:space:]]/.


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