Literal Expressions
"…" or '...'
Literals are expressed as strings enclosed in single or double-quotes.
output type
quantifier
configuration
String
default value: {1,1} - requires matching minimum 1 and maximum 1 times
charset = character set name enclosed in single or double quotes (for example charset="ISO-8859-1")
locale = string specifying IETF BCP 47 language tag enclosed in single or double quotes (see the list IANA language subtag registry). The default locale is English.
In case the constant contains a single quote or double quote you may either use the other for enclosing (i.e: use double quotes for enclosing if the string contains a single quote or vice versa).
Alternatively, you can escape it with a preceding backslash character \ (0x5c ASCII).
Constants are usually less interest for analytical purposes, hence in most cases, they are just matched - i.e values not exported for the query.
Example
Matching one or more characters 'a'.
aaa
Pattern:
"a"+ EOL