- Documentation
- Reference manual
- SWI-Prolog extensions
- The string type and its double quoted syntax
- Predicates that operate on strings
- atom_string/2
- number_string/2
- term_string/2
- term_string/3
- string_chars/2
- string_codes/2
- string_bytes/3
- text_to_string/2
- string_length/2
- string_code/3
- get_string_code/3
- string_concat/3
- split_string/4
- sub_string/5
- atomics_to_string/2
- atomics_to_string/3
- string_upper/2
- string_lower/2
- read_string/3
- read_string/5
- open_string/2
- Predicates that operate on strings
- The string type and its double quoted syntax
- SWI-Prolog extensions
- Packages
- Reference manual
Availability:built-in
name_value(String, Name, Value) :- sub_string(String, Before, _, After, "="), !, sub_atom(String, 0, Before, _, Name), sub_string(String, _, After, 0, Value).
The next example defines a predicate that inserts a value at a position. See sub_atom/5 for more examples.
string_insert(Str, Val, At, NewStr) :- sub_string(Str, 0, At, A1, S1), sub_string(Str, At, A1, _, S2), atomics_to_string([S1,Val,S2], NewStr).