Operators
String Specific Comparison Operators
Data Setup
SELECT * FROM cypher('graph_name', $$
CREATE (:Person {name: 'John'}),
(:Person {name: 'Jeff'}),
(:Person {name: 'Joan'}),
(:Person {name: 'Bill'})
$$) AS (result agtype);
Starts With
Performs case-sensitive prefix searching on strings.
SELECT * FROM cypher('graph_name', $$
MATCH (v:Person)
WHERE v.name STARTS WITH "J"
RETURN v.name
$$) AS (names agtype);
Results
names |
"John" |
"Jeff" |
"Joan" |
3 rows |
Contains
Performs case-sensitive inclusion searching in strings.
SELECT * FROM cypher('graph_name', $$
MATCH (v:Person)
WHERE v.name CONTAINS "o"
RETURN v.name
$$) AS (names agtype);
Results
names |
"John |
"Joan |
2 rows |
Ends With
Performs case-sensitive suffix searching on strings.
SELECT * FROM cypher('graph_name', $$
MATCH (v:Person)
WHERE v.name ENDS WITH "n"
RETURN v.name
$$) AS (names agtype);
Results
names |
"John" |
"Joan" |
2 rows |
Regular Expressions
AGE supports the use of POSIX regular expressions using the =~
operator. By default =~
is case sensitve.
Basic String Matching
The =~
operator when no special characters are given, act like the =
operator.
SELECT * FROM cypher('graph_name', $$
MATCH (v:Person)
WHERE v.name =~ 'John'
RETURN v.name
$$) AS (names agtype);
Results
names |
"John" |
1 rows |
Case insensitive search
Adding (?i)
at the beginning of the string will make the comparison case insensitive
SELECT * FROM cypher('graph_name', $$
MATCH (v:Person)
WHERE v.name =~ '(?i)JoHn'
RETURN v.name
$$) AS (names agtype);
names |
"John" |
1 rows |
The . Wildcard
The . operator acts as a wildcard to match any single character.
SELECT * FROM cypher('graph_name', $$
MATCH (v:Person)
WHERE v.name =~ 'Jo.n'
RETURN v.name
$$) AS (names agtype);
names |
"John" |
"Joan" |
2 rows |
The * Wildcard
The * wildcard after a character will match to 0 or more of the previous character
SELECT * FROM cypher('graph_name', $$
MATCH (v:Person)
WHERE v.name =~ 'Johz*n'
RETURN v.name
$$) AS (names agtype);
names |
"John" |
1 rows |
The + Operator
The + operator matches to 1 or more the previous character.
SELECT * FROM cypher('graph_name', $$
MATCH (v:Person)
WHERE v.name =~ 'Bil+'
RETURN v.name
$$) AS (names agtype);
Results
names |
"Bill" |
1 row |
The . and * wildcards together
You can use the . and * wildcards together to represent the rest of a string.
SELECT * FROM cypher('graph_name', $$
MATCH (v:Person)
WHERE v.name =~ 'J.*'
RETURN v.name
$$) AS (names agtype);
names |
"John" |
"Jeff" |
"Joan" |
2 rows |
Operator Precedence
Operator precedence in AGE is shown below:
Precedence | Operator | |
1 | . | Property Access |
2 | [] | Map and List Subscripting |
() | Function Call | |
3 | STARTS WITH | Case-sensitive prefix searching on strings |
ENDS WITH | Case-sensitive suffix searching on strings | |
CONTAINS | Case-sensitive inclusion searching on strings | |
=~ | Regular expression string matching | |
4 | - | Unary Minus |
5 | IN | Checking if an element exists in a list |
IS NULL | Checking a value is NULL | |
IS NOT NULL | Checking a value is not NULL | |
6 | ^ | Exponentiation |
7 | * / % | Multiplication, division and remainder |
8 | + - | Addition and Subtraction |
9 | = <> | For relational = and ≠ respectively |
< <= | For relational < and ≤ respectively | |
> >= | For relational > and ≥ respectively | |
10 | NOT | Logical NOT |
11 | AND | Logical AND |
12 | OR | Logical OR |