将模式中的通配符替换为其他文本+相同的数字

Question

我需要在这个特定的模式中找到一个大文本字符串的所有部分：

"\t\t" + number (between 1-999) + "\t\t" 

然后将每个引用替换为：

^{pr2}$

因此，最终结果是：

'TEXT\t\t24\t\tblah blah blahTEXT\t\t56\t\t'... and so on...

不同的数字介于1-999之间，因此需要某种通配符。在

有人能教我怎么做吗？谢谢！在

Answer 1

您需要使用Python的re库，尤其是re.sub函数：

import re  # re is Python's regex library
SAMPLE_TEXT = "\t\t45\t\tbsadfd\t\t839\t\tds532\t\t0\t\t"  # Test text to run the regex on

# Run the regex using re.sub (for substitute)
# re.sub takes three arguments: the regex expression,
# a function to return the substituted text,
# and the text you're running the regex on.

# The regex looks for substrings of the form:
# Two tabs ("\t\t"), followed by one to three digits 0-9 ("[0-9]{1,3}"),
# followed by two more tabs.

# The lambda function takes in a match object x,
# and returns the full text of that object (x.group(0))
# with "TEXT" prepended.
output = re.sub("\t\t[0-9]{1,3}\t\t",
                lambda x: "TEXT" + x.group(0),
                SAMPLE_TEXT)

print output  # Print the resulting string.