最普通查找就是需要找啥就写啥，没有使用正则的规则。如下是关于小说《灿烂千阳》中的一段话，从中找出单词friendship，可能出现多次：
s = """
# Mariam is only fifteen
# when she is sent to Kabul to marry the troubled and bitter Rasheed,
# who is thirty years her senior.
# Nearly two decades later,
# in a climate of growing unrest, tragedy strikes fifteen-year-old Laila,
# who must leave her home and join Mariam's unhappy household.
# Laila and Mariam are to find consolation in each other,
# their friendship to grow as deep as the bond between sisters,
# as strong as the ties between mother and daughter.
# With the passing of time comes Taliban rule over Afghanistan,
# the streets of Kabul loud with the sound of gunfire and bombs,
# life a desperate struggle against starvation, brutality and fear,
# the women's endurance tested beyond their worst imaginings.
# Yet love can move a person to act in unexpected ways,
# lead them to overcome the most daunting obstacles with a startling heroism.
# In the end it is love that triumphs over death and destruction.
# A Thousand Splendid Suns is an unforgettable portrait of a wounded country and
# a deeply moving story of family and friendship.
# It is a beautiful, heart-wrenching story of an unforgiving time,
# an unlikely bond and an indestructible love.
"""
使用正则前，先导入re模块，再定义正则表达式，然后使用findall方法找出所有匹配
import re
pat = 'friendship'
result = re.findall(pat,s)
print(result)
# 共找到两处：
# ['friendship', 'friendship']以上就是使用正则的最普通例子。如果要找出前缀为grow的单词，比如可能为grows, growing 等，最普通查找实现起来就不方便。
然而，借助于下面介绍的元字符、通用字符和捕获组合起来，便能应对解决复杂的匹配查找问题。
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