substrings
Looks for substrings found between two given delimiting strings. Find all results and return an array or find the first result and return it.
deepest-walk
The Deepest JSON Object Walking Library: Traverse and Modify Arrays, Objects, Numbers, Strings, and Substrings.
longestrepeatedstrings
Finds duplicated text strings and generates a report about the longest substrings or most frequent words in supplied text
strops
Provides simple and the most useful methods to string operations in JavaScript / Node.js