在熊猫数据框中的某些字符之前提取非数字字符
[英]Extract non-digit characters before certain character in pandas dataframe
问题描述
I have a pandas dataframe that looks like this: 
我有一个看起来像这样的熊猫数据框：
> row extract_column
> 0 412952266-desiredtext1»randtext-irrelevant
> 1 512952766-desiredtext1»randtext-irrelevant
> 2 212952766-desiredtext1»randtext-irrelevant
> 3 112953066-desiredtext1»randtext-irrelevant
> 4 712953066-desiredtext1»randtext-irrelevant
> 5 612953366-desiredtext1»randtext-irrelevant
> 6 912953366-desiredtext1»randtext-irrelevant
> 7 412954866-desiredtext1»randtext-irrelevant
> 8 312954966-desiredtext1»randtext-irrelevant
> 9 212954966-desiredtext1»randtext-irrelevant
> 10 612955866-desiredtext1»randtext-irrelevant
> 11 912256266-desiredtext1»randtext-irrelevant
> 12 812256366-desiredtext1»randtext-irrelevant
> 13 512256566-desiredtext1»randtext-irrelevant
> 14 412256566-desiredtext1»randtext-irrelevant
> 15 312256566-desiredtext1»randtext-irrelevant
> 16 212256566-desiredtext1»randtext-irrelevant
> 17 612256566-desiredtext1»randtext-irrelevant
> 18 812956666-desiredtext2»randtext-irrelevant
> 19 912957166-desiredtext2»randtext-irrelevant
> 20 012957866-desiredtext2»randtext-irrelevant
> 21 12952966-desiredtext2»randtext-irrelevant
> 22 2012953066-desiredtext2»randtext-irrelevant
> 23 012953066-desiredtext2»randtext-irrelevant
> 24 312953066-desiredtext2»randtext-irrelevant
> 25 112254166-desiredtext2»randtext-irrelevant
> 26 712254166-desiredtext2»randtext-irrelevant
I want to get the desiredtext1, desiredtext2 fields from extract_column. 我想从extract_column获取desiredtext1，desiredtext2字段。 The desired data is always followed by the » symbol and preceded by 9 digits followed by a dash. 所需的数据始终后跟»符号，并在前跟9个数字和一个破折号。
2 个解决方案
解决方案1
2 2019-02-19 17:39:49
尝试extract
df.extract_column.str.extract(r'-([^\.]*)\»', expand=False)
解决方案2
0 2019-02-19 18:02:03
df.extract_column.str.extract('-(\\w+)')
Out[100]:
0
0 desiredtext1
1 desiredtext1
2 desiredtext1
3 desiredtext1
4 desiredtext1
5 desiredtext1
6 desiredtext1
7 desiredtext1
8 desiredtext1
9 desiredtext1
10 desiredtext1
11 desiredtext1
12 desiredtext1
13 desiredtext1
14 desiredtext1
15 desiredtext1
16 desiredtext1
17 desiredtext1
18 desiredtext2
19 desiredtext2
20 desiredtext2
21 desiredtext2
22 desiredtext2
23 desiredtext2
24 desiredtext2
25 desiredtext2
26 desiredtext2
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