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Charcoal, 19 bytes ⭆⌕ＡΦＳ№+-ι-℅﹪⁻ι⊗κ²⁵⁶ Try it online! Link is to verbose version of code. Explanation: Ｓ Input string Φ Filtered where +- Literal …

Charcoal, 123 116 bytes Ｆ⪪Ｓ ¿Σι⊞υ⁺⟦Ｉι⟧Ｅβ⁰¿№βι§≔§υ±¹⊕⌕βι¹«≔⊟υζ≔⊟υη⊞υ∧∨⬤∧ζη∨¬λ⁼κ§ζλ⁻+ιＥ∧ζη⎇λ⁻κקζλ⊖﹪℅鳧⟦×κ§ζλ⁺κ§ζλ÷κ§ζλ⟧℅ι»Ｅυ⭆∨ι*⎇μ⎇λ⁺§β⊖μλωλ Try it online! Link is to verbose version of code. Since t …

Charcoal, 48 bytes ＷＳ≡§ι¹+⊞υ⁺⊟υ⊟υ-⊞υ⁻⊟υ⊟υr≔⊟υιu⊞υ↨υ⁰wＦＥ²⊟υ⊞υκ⊞υＩιＩυ Try it online! Link is to verbose version of code. Takes a list of newline-terminated words as input (could save two bytes by requi …

Charcoal, 79 65 bytes ⊞υ⟦ω⁶ω⟧Ｆυ¿¬ⅈ¿¬⌕ιθ⊟ι«≔§ι¹ηＦ⪪⟦η⁻⁶η!ω⁷+ω⁻⮌ηη~ω∧η⁻﹪ＸχＬηηη%⟧³⊞υＥκ⁺λ§ιμ Try it online! Link is to verbose version of code. Explanation: Based on @bsoelch's Python answer. ⊞υ⟦ω⁶ω⟧Ｆυ S …

Charcoal, 45 bytes Ｗ‹ⅈＬθ«≔§θ⊕ⅈι§≔θι⁻§θι§θ§θⅈ¿›§θι⁰Ｍ³→Ｊ§θ⁺²ⅈ⁰»⭆¹θ Try it online! Link is to verbose version of code. Explanation: Ｗ‹ⅈＬθ« Repeat while the instruction pointer is within range. ≔§θ⊕ⅈι …

Charcoal, 126 bytes ＷＳ⊞υιＵＯ⌈ＥυＬιＬυ Ｐ⪫υ¶≔⪪⮌Ｓ¹θ≔Ｅ׳⁰φ⁰η≔⁰ζ≔⁰εＷＫＫ«≔﹪§ηζ²⁵⁶δ≡ι<≔⁴ε>≔⁰ε^≔²εv≔⁶ε[≦⊖ζ]≦⊕ζ-§≔ηζ⊖δ+§≔ηζ⊕δ?≧⁺∧δ²ε.≔⁺ω℅δω,Ｆ¬¬θ§≔ηζ℅⊟θＰ⁰Ｍ✳ε»⎚ω Try it online! Link is to verbose version of code. T …

Retina 0.8.2, 44 bytes = =¶$`= -1=A` %O`. +`\+- ((-)+|\+*)=+ $2$.1 Try it online! Link includes test cases. Explanation: = =¶$`= Prepend all of the prefixes of the input that end in an =. -1=A` De …

Charcoal, 16 bytes ＩＥ⌕Ａθ=⁻ι⁺κ⊗№…θι- Try it online! Link is to verbose version of code. Explanation: θ Input string ⌕Ａ Find all indices of = Litera …

Charcoal, 224 bytes ＷＳ⊞υ⪪ι ≔Ｅ²⊞ＯＥ²⁸∧ι⁼¹⁵λ¹θＷ∧⊙θ§κ²⁸⬤θ⁼§κ²⁶﹪§κ²⁶Ｌυ«≔§θ⁰η≔⮌θθ≔§υ§η²⁶ζ≔⌕β§ζ¹ε≔⌕β§ζ±¹δ≔⎇⊕δ§ηδＩ§ζ±¹δ≡§§ζ⁰¦¹e§≔ηεδd§≔ηε⁺§ηεδu§≔ηεקηεδo§≔ηε﹪§ηεδgＦ‹⁰⎇⊕ε§ηεＩ§ζ¹§≔η²⁶⁺§η²⁶⊖δc«§≔η²⁸‹§η²⁷⁻Ｌη²⁹§≔η …

Charcoal, 90 55 bytes ＷＳ⊞υιＰ⪫Ｅυ⭆ι‽γ¶≔¹ηＷ¬⁼;ψ«≔§§υⅉⅈψ≔∨⊕⌕>^<vψηη✳⊗⊖ηψＪ﹪ⅈＬθ﹪ⅉＬυ Try it online! Link is to verbose version of code. Takes input as a list of newline-terminated lines. Explanation: ＷＳ⊞υι …

Charcoal, 87 bytes ≔⪪⮌Ｓ¹θＷθ≡⊟θ~ＦＥ²⊟υ⊞υκ:⊞υ§υ±¹!≔⊟υδ*⊞υ⪫⮌Ｅ²⊟υω(⊞υ⭆⊖Ｌ⌊ΦＥθ…⮌θ⊕λ›№κ)№κ(⊟θa⊞υ⪫()⊟υ^Ｆ⪪⮌⊟υ¹⊞θκS⊟υ Try it online! Link is to verbose version of code. Explanation: ≔⪪⮌Ｓ¹θ Reverse the input an …

(If there aren't any )s then the interpreter will give up while if there aren't enough )s then the interpreter will match until the last one.) …

Charcoal, 147 bytes Ｎθ≔θζＦ⁺⪫⪪⪫⪪Ｓ+~¦d¦_~¦z¦i«≡№DSdiz++__鲫Ｆ⁼²Ｌυ⊞υθＦ²⊞υ⎇⊖Ｌυζι»¹«≔⎇υθζε≡ιD≦⊖εS≦×εεd≦⊗εz≦⁻εε⎚¿υ⊞υε≔εζ»⊞υ⎇⁼aιθＩι¿‹²Ｌυ«≔⎇⁼+§υ¹⁺§υ⁰§υ²⁻§υ⁰§υ²ζ≔…⟦ζι⟧⁻Ｌυ³υ»»Ｉζ Try it online! Link is to verbo …

Charcoal, 55 bytes ＷＳ⊞υ⪪ι¹≔⁰θＷ¬№αψ«≔§§υⅉⅈψ§≔§υⅉⅈTＦ№>^<vψ≔⊗⌕>^<ψθＭ⊕⁼#ψ✳θ»⎚ψ Try it online! Link is to verbose version of code. Takes input as a newline-terminated list of strings and outputs A or B, o …

Charcoal, 35 bytes ”y≔⁰θＦ⁺Ｓψ≡ι”ＦＡ⭆⪪”y≔,θＩ,θ”,⁺§ιλκ”yＩθ Try it online! Generates this Charcoal program: ≔⁰θＦ⁺Ｓψ≡ιa≔ＸθＩ3θb≔×θＩ2θc≔⁺θＩ15θd≔⎇⁰θＩ0θe≔∕θＩ8θＩθ Try it online! Explanation: ”y≔⁰θＦ⁺Ｓψ≡ι” Prin …