A list of the different UTF spaces

utf-spaces.js

utfSpaces = [
  {
    name: 'Space',
    utf: '\u0020',
    html: [' ', ' '],
    breaking: true,
    width: 'Typically 1/4 em',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Thin space',
    utf: '\u2009',
    html: [' ', ' ', ' '],
    breaking: true,
    width: '1/5 em, can be 1/6 em',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Hair space',
    utf: '\u200A',
    html: [' ', ' '],
    breaking: true,
    width: 'Narrower than a thin space (less than 1/5 em or 1/6em)',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Zero width space',
    utf: '\u200B',
    html: ['​', '​'],
    breaking: true,
    width: 'None (invisible character)',
    unicode_category: 'Other, Format',
    matched_by_s_character_class: false
  },
  {
    name: 'Medium mathematical space',
    utf: '\u205F',
    html: [' ', ' '],
    breaking: true,
    width: '4/18 em',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Ogham space mark',
    utf: '\u1680',
    html: [' ', ' '],
    breaking: true,
    width: 'Usually represented by a 1em dash',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Mongolian vowel separator',
    utf: '\u180E',
    html: ['᠎', '᠎'],
    breaking: false,
    width: 'None (invisible character)',
    unicode_category: 'Other, Format',
    matched_by_s_character_class: false
  },
  {
    name: 'EN quad',
    utf: '\u2000',
    html: [' ', ' '],
    breaking: true,
    width: '1 en (1/2 em)',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'EM quad',
    utf: '\u2001',
    html: [' ', ' '],
    breaking: true,
    width: '1 em',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'EN space',
    utf: '\u2002',
    html: [' ', ' ', ' '],
    breaking: true,
    width: '1 en (1/2 em)',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'EM space',
    utf: '\u2003',
    html: [' ', ' ', ' '],
    breaking: false,
    width: '1 em',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Three-per-em space',
    utf: '\u2004',
    html: [' ', ' '],
    breaking: false,
    width: '1/3 em',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Four-per-em space',
    utf: '\u2005',
    html: [' ', ' '],
    breaking: false,
    width: '1/4 em',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Six-per-em space',
    utf: '\u2006',
    html: [' ', ' '],
    breaking: false,
    width: '1/6 em',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Non breaking space',
    utf: '\u00A0',
    html: [' ', ' ', ' '],
    breaking: false,
    width: 'Typically 1/4 em, same as a regular space but usually not adjusted with justification',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Narrow no-break space',
    utf: '\u202F',
    html: [' ', ' '],
    breaking: false,
    width: 'Narrower than a non-breaking or breaking space',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Figure space',
    utf: '\u2007',
    html: [' ', ' '],
    breaking: false,
    width: 'The width of digits (tabular space)',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Punctuation space',
    utf: '\u2008',
    html: [' ', ' '],
    breaking: true,
    width: 'Width of a period (.)',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Word joiner',
    utf: '\u2060',
    html: ['⁠', '&8288;'],
    breaking: false,
    width: 'None (invisible character)',
    unicode_category: 'Other, Format',
    matched_by_s_character_class: false
  },
  {
    name: 'Ideographic space',
    utf: '\u3000',
    html: ['　', '　'],
    breaking: false,
    width: 'The width of ideographic (CJK) characters',
    unicode_category: 'Separator, Space',
    matched_by_s_character_class: true
  },
  {
    name: 'Zero width no-break space (BOM often intepreted as)',
    utf: '\uFEFF',
    html: ['', ''],
    breaking: false,
    width: 'None (invisible character)',
    unicode_category: 'Other, Format',
    matched_by_s_character_class: true
  },
  {
    name: 'Character tabulation',
    utf: '\u0009',
    html: ['	', '	', '	'],
    width: 'Up to the next tab stop',
    unicode_category: 'Other, Control',
    matched_by_s_character_class: true
  },
  {
    name: 'Line tabulation',
    utf: '\u000B',
    html: ['', ''],
    width: 'doesn’t apply (vertical)',
    unicode_category: 'Other, Control',
    matched_by_s_character_class: true
  }
  
];

Here's a way to know the type of spaces used in a string:

var str = ' 1 016,00 € ';
console.table(
  str.match(
    new RegExp(
      `[${utfSpaces.map(s => s.utf).join('')}]`, 'g'
    )
  ).filter(
    (value, index, self) => self.indexOf(value) === index
  ).map(
    s => utfSpaces.find(
      u => u.utf === s
    )
  ).map(
    u => (
      {...u, ['utf']: escape(u.utf).replace('%', '\\')}
    )
  )
)