Delstreng

Delstreng is a term used in Danish and Norwegian to refer to a substring, defined as a contiguous sequence of characters within a string. In English-language programming literature, this concept is commonly called a substring. Delstreng can be any consecutive block of characters and is characterized by its start position and its length.

Formally, if s is a string, a delstreng is a block of characters from s starting at some position i and ending at position j (with length j − i, depending on indexing convention). The length of a delstreng ranges from 0 (the empty string) to the length of the entire string. Delstreng are fundamental building blocks in text processing, parsing, and data extraction, enabling operations such as retrieval, comparison, and pattern matching.

Common operations include extracting a delstreng from a given string, searching for a delstreng within a string, and checking for containment or equality with other strings. For example, in the string "delstreng" the delstreng consisting of the first three characters is "del". The exact syntax and indexing convention (such as zero-based or one-based indexing) depend on the programming language.

In programming contexts, languages provide functions or operators to work with delstreng, often named substring, substr, slice, or similar. These tools support a variety of tasks, from simple extraction to complex text processing and parsing. Understanding delstreng is also important in areas like regular expressions and string algorithms, where pattern-based extraction and matching rely on the concept of substrings.