pymongo-正则表达式来查询

 

def query():
    conn = Connection('127.0.0.1',27017)
    db    = getattr(conn,'dbname')
    coll   = getattr(db,'collname')

    #使用正则查询
    import re
    q      = rs.compile(r'add') #完成正则 r'.*'  ,r'[a-z]+'
    rst    = coll.find({'field' : { '$regex' : q } })
    print rst.count()  #打印查询结果
    rst    =coll.find({'field':{'$regex':'^'+query}})
  #查询所有以query开头的文档
    #查询方式2
    rst    = coll.find({'field' : { '$regex' : r '[a-z]+'} })
    print rst.count()