Re Modules | Python 3.5.1

Https://docs.python.org/3/library/re.html

Http://www.cnblogs.com/PythonHome/archive/2011/11/19/2255459.html

1. Provide regular expression-related operations

2. Pattern strings and matching strings can be Unicode or 8-bit strings, but cannot be mixed

3. Syntax

　　Http://www.cnblogs.com/book-book/p/5411634.html

'. ' can match ' \ n ' in Dotall mode

' ^ ', ' $ ' can match multi-line start and end in multiline mode

(? ailmsux):

A:ascii-only

I:ignore case

L:local dependent

M:multiple Line

S:dot All

U:unicode-only

X:verbose

(? P<name>, ...)

(? P=name)

(?#...)

(? <= ...)

(?<!...)

(? (id/name) Yes-pattern|no-pattern)

\a, \z Match string start and end positions

4. Module contents

Re.compile (pattern, flags=0)

Returns the Regexobject object

Flags are separated by ' | ' When there are multiple

Re. A Re. Ascii

Re. DEBUG

Re. I Re. IGNORECASE

Re. L Re. LOCAL

Re. M Re. MULTILINE

Re. S Re. Dotall

Re. X Re. VERBOSE

Re.search (Pattern, string, flags=0)

Matches anywhere in a string, returns the first match to the object (Match object), or returns none

Re.match (Pattern, string, flags=0)

Match at the start of string, even if there is a re. M property)

Re.fullmatch (Pattern, string, flags=0)

Returns the corresponding match object when the entire string can be matched by pattern, otherwise none is returned

Re.split (Pattern, String, maxsplit=0, flags=0)

Using pattern to divide a string, if pattern is enclosed in parentheses, the segmented part that can be matched by the pattern will remain in the result.

Maxsplit is not 0 o'clock, the remainder is retained in the result after splitting maxsplit times

If the beginning (or end) can be matched by pattern, the result list starts with a blank string (or ends)

Currently: Empty pattern will be ignored, and if the pattern may be empty, there is futurewarning, if the pattern is empty, there is valueerror

Re.findall (Pattern, string, flags=0)

Find all non-overlapping matching substrings and return a list

Re.finditer (Pattern, string, flags=0)

Find the matching substring and return the iterator, if no match returns an empty list

Re.sub (Pattern, Repl, String, count=0, flags=0)

Replace a string with a pattern-matched substring with REPL

Replace count times when count is not 0

REPL can be a function

RE.SUBN (Pattern, Repl, String, count=0, flags=0)

Same as Re.sub () but re.subn () returns a two-tuple containing the number of heart strings and replacement words

Re.escape (String)

To escape the non-alphanumeric character of a string

Re.purge ()

Clear the RE cache

exception

Re.error (msg, Pattern=none, Pos=none)

　　Regular Expression Object:

Regex.search (string[, pos[, Endpos])

Regex.match (string[, pos[, Endpos])

Regex.fullmatch (string[, pos[, Endpos])

Regex.Split (String, maxsplit=0)

Regex.findall (string[, pos[, Endpos])

Regex.finditer (string[, pos[, Endpos])

Regex.sub (Repl, String, count=0)

Regex.subn (Repl, String, count=0)

Regex.flags

Regex.groups

Regex.groupindex

Regex.pattern

　　Match Object:

Match.expand (template)

Match.group ([group1,...])

Match.Groups (Default=none)

Match.groupdict (Default=none)

Match.start ([group]) returns the match start position

Match.end ([group]) returns the match end position

Match.span ([group]) returns a two-tuple containing the starting end of the match

Match.pos

Match.endpos

Match.lastindex

Match.lastgroup

Match.re

Match.string

Re Modules | Python 3.5.1