[　　　　string text = "select * from [admin] where aa=1 and cc='b' order by aa desc "; 　　　　 Regex reg = null; reg = new Regex(@"\s+from\s

能够从sql语句中匹配表名，表的简称。使用的是python的正则表达式匹配的，本想做一个和plsql类似的工具，还没搞完整，先记录一下

# -*- coding: UTF-8 -*-

import re

keylist=['ACCESS','ADD','ALL','ALTER','AND','ANY','AS','ASC','AUDIT','BETWEEN','BY','CHAR','CHECK','CLUSTER','COLUMN','COMMENT','COMPRESS','CONNECT','CREATE','CURRENT','DATE','DECIMAL','DEFAULT','DELETE','DESC','DISTINCT','DROP','ELSE','EXCLUSIVE','EXISTS','FILE','FLOAT','FOR','FROM','GRANT','GROUP','HAVING','IDENTIFIED','IMMEDIATE','IN','INCREMENT','INDEX','INITIAL','INSERT','INTEGER','INTERSECT','INTO','IS','LEVEL','LIKE','LOCK','LONG','MAXEXTENTS','MINUS','MLSLABEL','MODE','MODIFY','NOAUDIT','NOCOMPRESS','NOT','NOWAIT','NULL','NUMBER','OF','OFFLINE','ON','ONLINE','OPTION','OR','ORDER','P','CTFREE','PRIOR','PRIVILEGES','PUBLIC','RAW','RENAME','RESOURCE','REVOKE','ROW','ROWID','ROWNUM','ROWS','SELECT','SESSION','SET','SHARE','SIZE','SMALLINT','START','SUCCESSFUL','SYNONYM','SYSDATE','TABLE','THEN','TO','TRIGGER','UID','UNION','UNIQUE','UPDATE','USER','VALIDATE','VALUES','VARCHAR','VARCHAR2','VIEW','WHENEVER','WHERE','WITH']

#sq3string = r"(\b[rRbB])?'''[^'\\]*((\\.|'(?!''))[^'\\]*)*(''')?"

sq3string = r"(\b[rRbB])?'[^'\\]*((\\.|'(?!''))[^'\\]*)*?(')?"      #倒数第二个？是为了最小匹配

sqs1 = r"(\b[rRbB])?"

sqs2 = r"A((?!table).)+B"    # 匹配排除table

selectmatch = r"(?!')*\bfrom\b\s+\b(?P\w+)\b\s+\b(?P\w+)\b(?!')*"  #匹配select语句中的表名和表名的简写

insertmatch = r"(?!')*\binsert\b\s+\binto\b\s+\b(?P\w+)\b\s+\b(?P\w+)\b(?!')*"  #匹配insert语句中的表名和表名的简写

updatematch = r"(?!')*\bupdate\b\s+\b(?P\w+)\b\s+\b(?P\w+)(?!')+"  #匹配insert语句中的表名和表名的简写

#chars="select 'from tt we ,d f'*,t able from dual T where sfsf"

selectchars = "select *,'select * from tab3 T3 where T3.s' from tab1 T where a='select * from tab2 T2 where T2.s'"

insertchars = "insert into tab1 T1 (as) values (t,2,_)"

updatechars = "update tab1 t set df='update tab2 sdf set mm=1'"

#print(''.join([i+'|' for i in keylist])[0:-1])

##chars = selectchars

##

### 下面是去掉语句中的字符串，因为字符串可能含有sql语句

##sqloutstr = re.finditer(sq3string, chars, re.S)

##slt = [i for i in sqloutstr]

##slt.reverse()

##if sqloutstr:

##    for match in slt:

##        pl = match.span()

##        chars = chars[:pl[0]]+chars[pl[1]:]

##print(chars)

##

##mstr = selectmatch

##prog = re.compile(mstr, re.S|re.IGNORECASE)

##

##m1 = prog.match(chars)

##

##if m1:

##    print('m1.string',m1.string)

##    print('匹配到:',chars[m1.start():m1.end()])

##m = prog.search(chars)

##if m:

##    print('m',m.groupdict().items())

##    for key, value in m.groupdict().items():

##        print('key, value',key, value)

selectprog = re.compile(selectmatch, re.S|re.IGNORECASE)

updateprog = re.compile(updatematch, re.S|re.IGNORECASE)

inserprog = re.compile(insertmatch, re.S|re.IGNORECASE)

def delSqlStr(sqlstr):

sqloutstr = re.finditer(sq3string, sqlstr, re.S)

slt = [i for i in sqloutstr]

slt.reverse()

if sqloutstr:

for match in slt:

pl = match.span()

sqlstr = sqlstr[:pl[0]]+sqlstr[pl[1]:]

return sqlstr

def getSelectTBN(sqlstr):

""" 返回select语句的 表名,表名简写"""

TabName = None

shortTabName = None

m = selectprog.search(sqlstr)

if m:

for key, value in m.groupdict().items():

if key == 'table_sn':

shortTabName = value

if key == 'table_name':

TabName = value

#print('getSelectTBN  TabName=',TabName, 'shortTabName=',shortTabName)

return TabName,shortTabName

def getUpdateTBN(sqlstr):

""" 返回select语句的 表名,表名简写"""

TabName = None

shortTabName = None

m = updateprog.search(sqlstr)

if m:

for key, value in m.groupdict().items():

if key == 'table_sn':

shortTabName = value

if key == 'table_name':

TabName = value

#print('getUpdateTBN  TabName=',TabName, 'shortTabName=',shortTabName)

return TabName,shortTabName

def getInsertTBN(sqlstr):

""" 返回select语句的 表名,表名简写"""

TabName = None

shortTabName = None

m = inserprog.search(sqlstr)

if m:

for key, value in m.groupdict().items():

if key == 'table_sn':

shortTabName = value

if key == 'table_name':

TabName = value

#print('getInsertTBN  TabName=',TabName, 'shortTabName=',shortTabName)

return TabName,shortTabName

def getTabNameShortName(sqlstr):

tmpsqlstr = delSqlStr(sqlstr)

TabName = None

shortTabName = None

TabName,shortTabName = getSelectTBN(tmpsqlstr)

if TabName:

return TabName,shortTabName

TabName,shortTabName = getUpdateTBN(tmpsqlstr)

if TabName:

return TabName,shortTabName

TabName,shortTabName = getInsertTBN(tmpsqlstr)

if TabName:

return TabName,shortTabName

chars = "select * from tab1 T1 where T1.name='ssd'"

print(chars)

print(getTabNameShortName(chars))

chars = "update Tab2 T id=12,name='xiaoxiao'"

print(chars)

print(getTabNameShortName(chars))

chars = "insert into tab3 t3 values(13,'dada')"

print(chars)

print(getTabNameShortName(chars))

[匹配ip地址的python正则表达式pattern ='^([01]\d\d|2[0-4]\d|25[0-5])\.([01]\d\d|2[0-4]\d|25[0-5])\.([01]\d\d|2[0-4]\d|25[0-5])\.([01]\d\d|2[0-4]\d|25[0-5

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