subexpression

From sub- +‎ expression.

subexpression (plural subexpressions)

(mathematics, programming) An expression that is a part of a larger expression.
- 2003, Rob Brooks-Bilson, Programming ColdFusion MX:
  The third part of the regular expression, \1, is the backreference and tells ColdFusion to refer back to the first subexpression […]
- 2020 February 24, “Handling PowerShell's Versatile Subexpressions”, in Clear-Script‎:
  Something to note that's shared between all subexpressions (as well as scriptblocks) is that the end of a line does not terminate the subexpression.

expression that is a part of a larger one

English