
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 http://tungwaiyip.info/software/pyregex.html. 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. Options: -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 individually, 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 verbose *, +, ? and {m,n} are greedy. Append the ? qualifier to match non-greedily. Special Sequences ------------------------------------------------------------------------ \number matches the contents of the group of the same number. Groups are 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 detail http://docs.python.org/lib/re-syntax.html
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