Extract specific word from the string using Python

Question

I have a string Job_Cluster_AK_Alaska_Yakutat_CDP.png

From the string above, I want to extract only the word after this word Job_Cluster_AK_Alaska_ and before .png.

So basically I want to extract after fourth word separated by underscore and till the word before .png

I am new to regex.

Finally I want only Yakutat_CDP.

You need to describe what exactly you want to do in the general case, not just on this particular string. — interjay
– interjay, Commented Jan 21, 2019 at 14:09
But you still didn't describe what you want to do in the general case. i.e. one which may contain a different string. — interjay
– interjay, Commented Jan 21, 2019 at 14:14
Still not what I asked.... You need to write a general description like "I want to extract the fifth and sixth words, which are separated by underscores." (this is just an example, I don't know if it's what you actually need because you won't say). Otherwise you'll get an answer like the one below which only works with a specific string. — interjay
– interjay, Commented Jan 21, 2019 at 14:19

Praind · Accepted Answer · 2019-01-21 14:45:14Z

2

I think what you are asking for is something like this:

import os

# I think you will have different jobs/pngs, so pass these variables from somewhere
jobPrefix = 'Job_Cluster_AK_Alaska_'
pngString = 'Job_Cluster_AK_Alaska_Yakutat_CDP.png'

# Split filename/extension
pngTitle = os.path.splitext(pngString)[0]

# Get the filename without the jobPrefix
finalTitle = pngTitle[len(jobPrefix):]

Edit

Try to avoid regular expressions as it is much slower in general than string slicing

edited Jan 21, 2019 at 14:45

answered Jan 21, 2019 at 14:32

Praind

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Comments

Ivaylo Strandjev · Accepted Answer · 2019-01-21 14:13:12Z

2

You can do it even without regex like so:

s = 'Job_Cluster_AK_Alaska_Yakutat_CDP.png'
print(s[len('Job_Cluster_AK_Alaska_'):-len('.png')])

In essence here I take the substring starting immediately after Job_Cluster_AK_Alaska_ and ending before .png.

Still probably a regex approach is more readable and maintanable:

import re
m = re.match('Job_Cluster_AK_Alaska_(.*).png')
print(m[1])

edited Jan 21, 2019 at 14:13

answered Jan 21, 2019 at 14:11

Ivaylo Strandjev

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2 Comments

venkat Over a year ago

I don't want to give explicitly the string name inside re.match(), Could you please help me regardless of any string (s) it should give output like after 'Job_Cluster_AK_Alaska_' and before '.png'

Ivaylo Strandjev Over a year ago

I am do not understand what is the string name in this context

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