crandas.re#

Regular expression matching

class crandas.re.Re(expr)#

Bases: object

Represents a regular expression for use with crandas.

Can be used as an argument to CSeries.fullmatch().

Constructed from a string representing the regular expression. Supported operators:

|: union
*: Kleene star (zero or more)
+: one or more
?: zero or one
{n}: exactly n times
{min,}: at least min times
{,max}: at most max times
{min,max}: at least min and at most max times
.: any character (note that this also matches non-printable characters)
(, ): regexp grouping
[...]: set of characters (including character ranges, e.g., [A-Za-z])
\d: digits (equivalent to [0-9])
\s: whitespace (equivalent to [\\ \t\n\r\f\v])
\w: alphanumeric and underscore (equivalent to [a-zA-Z0-9_])
(?1), (?2), …: substring (given as additional argument to CSeries.fullmatch())

Internally, this class is based on PythonRegex from pyformlang. For more details, see here and here.