Attention: Here be dragons
This is the
(unstable) version of this documentation, which may document features
not available in or compatible with released stable versions of Godot.
Class for searching text for patterns using regular expressions.
A regular expression (or regex) is a compact language that can be used to recognize strings that follow a specific pattern, such as URLs, email addresses, complete sentences, etc. For example, a regex of
ab[0-9] would find any string that is
ab followed by any number from
9. For a more in-depth look, you can easily find various tutorials and detailed explanations on the Internet.
To begin, the RegEx object needs to be compiled with the search pattern using compile before it can be used.
var regex = RegEx.new() regex.compile("\\w-(\\d+)")
The search pattern must be escaped first for GDScript before it is escaped for the expression. For example,
compile("\\d+") would be read by RegEx as
compile("\"(?:\\\\.|[^\"])*\"") would be read as
Using search, you can find the pattern within the given text. If a pattern is found, RegExMatch is returned and you can retrieve details of the results using methods such as RegExMatch.get_string and RegExMatch.get_start.
var regex = RegEx.new() regex.compile("\\w-(\\d+)") var result = regex.search("abc n-0123") if result: print(result.get_string()) # Would print n-0123
The results of capturing groups
() can be retrieved by passing the group number to the various methods in RegExMatch. Group 0 is the default and will always refer to the entire pattern. In the above example, calling
result.get_string(1) would give you
This version of RegEx also supports named capturing groups, and the names can be used to retrieve the results. If two or more groups have the same name, the name would only refer to the first one with a match.
var regex = RegEx.new() regex.compile("d(?<digit>[0-9]+)|x(?<digit>[0-9a-f]+)") var result = regex.search("the number is x2f") if result: print(result.get_string("digit")) # Would print 2f
If you need to process multiple results, search_all generates a list of all non-overlapping results. This can be combined with a
for loop for convenience.
for result in regex.search_all("d01, d03, d0c, x3f and x42"): print(result.get_string("digit")) # Would print 01 03 0 3f 42
Example of splitting a string using a RegEx:
var regex = RegEx.new() regex.compile("\\S+") # Negated whitespace character class. var results =  for result in regex.search_all("One Two \n\tThree"): results.push_back(result.get_string()) # The `results` array now contains "One", "Two", "Three".
Tip: You can use Regexr to test regular expressions online.
clear ( )
get_group_count ( ) const
get_names ( ) const
get_pattern ( ) const
is_valid ( ) const
void clear ( )
This method resets the state of the object, as if it was freshly created. Namely, it unassigns the regular expression of this object.