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 give, 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 striong 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
2	()	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