pyregex is a command line tools for constructing and testing Python's
regular expression. Features includes text highlighting, detail break
down of match groups, substitution and a syntax quick reference. It is
released in the public domain.

Screenshot and download from

Wai Yip Tung

Usage: pyregex.py [options] "-"|filename regex [replacement [count]]

Test Python regular expressions. Specify test data's filename or use
to enter test text from console. Optionally specify a replacement text.

-f filter mode
-n nnn limit to examine the first nnn lines. default no limit.
-m show only matched line. default False

Regular Expression Syntax

Special Characters
. matches any character except a newline
^ matches the start of the string
$ matches the end of the string or just before the newline at the
end of
the string
* matches 0 or more repetitions of the preceding RE
+ matches 1 or more repetitions of the preceding RE
? matches 0 or 1 repetitions of the preceding RE
{m} exactly m copies of the previous RE should be matched
{m,n} matches from m to n repetitions of the preceding RE
\ either escapes special characters or signals a special sequence
[] indicate a set of characters. Characters can be listed
or a range of characters can be indicated by giving two
characters and
separating them by a "-". Special characters are not active
inside sets
Including a "^" as the first character match the complement of
the set
A|B matches either A or B
(...) indicates the start and end of a group
(?...) this is an extension notation. See documentation for detail
(?iLmsux) I ignorecase; L locale; M multiline; S dotall; U unicode; X

*, +, ? and {m,n} are greedy. Append the ? qualifier to match

Special Sequences
\number matches the contents of the group of the same number. Groups
numbered starting from 1
\A matches only at the start of the string
\b matches the empty string at the beginning or end of a word
\B matches the empty string not at the beginning or end of a word
\d matches any decimal digit
\D matches any non-digit character
\g<name>use the substring matched by the group named 'name' for sub()
\s matches any whitespace character
\S matches any non-whitespace character
\w matches any alphanumeric character and the underscore
\W matches any non-alphanumeric character
\Z matches only at the end of the string

See the Python documentation on Regular Expression Syntax for more


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