Use real symbols, not alphabetic substitutes

Textlint rule to check and fix real symbols.

npm install --save textlint-rule-real-symbols

textlint --fix --rule real-symbols README.md

Or enable the rule in your .textlintrc:

{
  "rules": {
    "real-symbols": true
  }
}

Read more about configuring textlint.

• 3 x 2 = 6 → 3 × 2 = 6
• 3 - 2 = 1 → 3 − 2 = 1
• 3 >= 2 → 3 ≥ 2
• 1 =< 2 → 1 ≤ 2
• 99999 >> 1 → 99999 ≫ 1
• 1 << 99999 → 1 ≪ 99999
• 10 +- 1 → 10 ± 1
• 10 -+ 1 → 10 ∓ 1
• a <-> b → a ↔ b
• a <=> b → a ⇔ b
• a <- b → a ← b
• a -> b → a → b
• a <= b → a ⇐ b
• a => b → a ⇒ b
• (c) 2015 Foo → © 2015 Foo
• Foo (r) → Foo ®
• Foo(tm) → Foo™
• Foo bar baz... → Foo bar baz…
• Foo -- bar → Foo — bar
• 2009-2015 → 2009–2015

MIT