如何提取文本文件中与正则表达式匹配的行号 [英] How to extract lines numbers that match a regular expression in a text file

问题描述

我正在做一个关于统计机器翻译的项目，其中我需要从匹配正则表达式(任何带有粒子out"的非分隔短语动词)的带 POS 标记的文本文件中提取行号，然后写文件的行号(在 python 中).

I'm doing a project on statistical machine translation in which I need to extract line numbers from a POS-tagged text file that match a regular expression (any non-separated phrasal verb with the particle 'out'), and write the line numbers to a file (in python).

我有这个正则表达式:'w*_VB.?sout_RP' 和我的 POS 标签文本文件:'Corpus.txt'.我想得到一个行号与上述正则表达式匹配的输出文件，并且输出文件每行应该只有一个行号(没有空行)，例如:

I have this regular expression: 'w*_VB.?sout_RP' and my POS-tagged text file: 'Corpus.txt'. I would like to get an output file with the line numbers that match the above-mentioned regular expression, and the output file should just have one line number per line (no empty lines), e.g.:

2

5

44

到目前为止，我的脚本中只有以下内容:

So far all I have in my script is the following:

OutputLineNumbers = open('OutputLineNumbers', 'w')
with open('Corpus.txt', 'r') as textfile:
    phrase='w*_VB.?sout_RP'
    for phrase in textfile: 

OutputLineNumbers.close()

知道如何解决这个问题吗?

Any idea how to solve this problem?

提前感谢您的帮助！

推荐答案

这应该可以解决您的问题，假设您在变量短语"中有正确的正则表达式

This should solve your problem, presuming you have correct regex in variable 'phrase'

import re

# compile regex
regex = re.compile('[0-9]+')

# open the files
with open('Corpus.txt','r') as inputFile:
    with open('OutputLineNumbers', 'w') as outputLineNumbers:
        # loop through each line in corpus
        for line_i, line in enumerate(inputFile, 1):
            # check if we have a regex match
            if regex.search( line ):
                # if so, write it the output file
                outputLineNumbers.write( "%d
" % line_i )

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