LostSideDead Pattern Analyzer (JavaScript)

The analyzer identifies identifiers like LostSideDead by decomposing them into words, extracting structured two-letter pairs, connecting overlapping links, and verifying a progressive group-number sequence (non-decreasing). It surfaces the acronym, chain links, case toggles, and group cohesion.

1. CamelCase splitting: Break tokens on uppercase boundaries, preserving consecutive uppercase (e.g., JSONData → JSON, Data).
2. Pair extraction:
   • If a word’s first and last letters match ignoring case (e.g., Dead, Level), emit Upper(first)+lower(first) to expose a case-toggle (e.g., Dd, Ll).
   • Else if length ≥3, take first+third (e.g., Lost → Ls).
   • Fallbacks: length 2 → first+second; length 1 → duplicated letter.
3. Acronym: Uppercase first letters of each word (e.g., LSD).
4. Overlap detection: Adjacent pairs chain when the second character of one equals the first of the next (case-insensitive). If the case differs, it is a case toggle.
5. Group sequencing: Flatten pair letters (e.g., L s S d D d) and assign group numbers:
   • Start at 1 for the first letter.
   • The second letter of a pair increments if it differs (case-insensitive) from the first; otherwise reuses the same group.
   • The first letter of the next pair reuses previous group if it overlaps; otherwise increments.
   • The second letter of that pair behaves similarly relative to its own first.
   Require the sequence to be non-decreasing (e.g., 1 2 2 3 3 3) to reflect a coherent left-to-right progression. This can be toggled off.

Shows the decomposition with the updated toggle rule (Dead → Dd) and the non-decreasing group sequence 1 2 2 3 3 3.

Enter text containing CamelCase-style tokens. The analyzer extracts candidate tokens, applies the full pattern logic, and displays matches. Use the checkbox to require the non-decreasing group property.

Below is the exact logic used by the analyzer. You can copy or download it as standalone code.