olemus
määratletud tähistuse ja ehitusega avaldis
otsitava teksti malli ja käsitlusviisi spetsifitseerimiseks

WIktionary:
1. (computing theory) a concise description of a regular formal language with notations for concatenation, alternation, and iteration (repetition) of subexpressions
2. (computing, more generally) any pattern for text matching or searching, frequently offering more or less functionality than a theoretical regular expression

ISO/IEC/IEEE 9945:
mall spetsiifiliste stringide valimiseks
mingist märgistringide kogumist
= a pattern that selects specific strings
from a set of character strings

ülevaateid
https://cizixs.com/2013/07/29/basic-regular-expression/

https://www.regular-expressions.info/quickstart.html

http://www.regular-expressions.info/tutorial.html

https://en.wikipedia.org/wiki/Regular_expression

http://web.mit.edu/hackl/www/lab/turkshop/slides/regex-cheatsheet.pdf

https://doc.lagout.org/programmation/Regular%20Expressions/Mastering%20Regular%20Expressions_%20Understand%20Your%20Data%20and%20Be%20More%20Productive%20%283rd%20ed.%29%20%5BFriedl%202006-08-18%5D.pdf