Extract word from string Using python regex

Question

I want to extract a Model Number from string ,

/dev/sda:

ATA device, with non-removable media
    Model Number:       ST500DM002-1BD142                       
    Serial Number:      W2AQHKME
    Firmware Revision:  KC45    
    Transport:          Serial, SATA Rev 3.0

Regex I wrote,

re.search("Model Number:(\s+[\w+^\w|d]\n\t*)", str)

But issue is, its not matching any special characters (non ascii) in string str

Python 2.6

Note: String can be combination any characters/digits (including special)

Is this Python 2 or 3? What sample input can you give us that *doesn't* match? — Martijn Pieters, Jul 22 '14 at 10:45
@MartijnPieters I have posted the string above. Sorry I dont understand what you are asking for — Deepak Ingole, Jul 22 '14 at 10:48
Note that `[\w+^\w|d]` is **not** a grouping but a *character class*. You are matching **one** character that is a member of the set `\w`, `+`, `^`, `|` or `d`. — Martijn Pieters, Jul 22 '14 at 10:53
*special* has no pre-defined meaning, and I took it to mean *not-ASCII*. What do *you* mean by it? — Martijn Pieters, Jul 22 '14 at 10:54
Then why the *non-ASCII* qualifier? You mean *not letters or digits* instead? Non-ASCII means you have Latin-1 or higher codepoints, and thus either 8-bit byte string data or `unicode` objects. — Martijn Pieters, Jul 22 '14 at 11:07

Avinash Raj · Accepted Answer · 2014-07-22T11:02:45.423

6

Your regex would be,

Model Number:\s*([\w-]+)

Python code would be,

>>> import re
>>> s = """
... 
... /dev/sda:
... 
... ATA device, with non-removable media
...     Model Number:       ST500DM002-1BD142                       
...     Serial Number:      W2AQHKME
...     Firmware Revision:  KC45    
...     Transport:          Serial, SATA Rev 3.0"""
>>> m = re.search(r'Model Number:\s*([^\n]+)', s)
>>> m.group(1)
'ST500DM002-1BD142'

Explanation:

Model Number:\s* Matches the string Model Number: followed by zero or more spaces.
([^\n]+) Captures any character but not of a newline character one or more times.

edited Jul 22 '14 at 11:02

answered Jul 22 '14 at 10:48

Avinash Raj

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It fails in case of word separated with spaces `Model Number: Virtual Box` – Deepak Ingole Jul 22 '14 at 10:50
@Pilot use `[-\s\w]+` in that case. – hjpotter92 Jul 22 '14 at 10:52
@hjpotter92 Results `'Model Number: ST500DM002-1BD142 \n\tSerial Number'` – Deepak Ingole Jul 22 '14 at 10:53
1

@Pilot use `Model Number:\s*([^\n]+)` – Avinash Raj Jul 22 '14 at 10:56
sure. May i add that to my answer. – Avinash Raj Jul 22 '14 at 10:59

Extract word from string Using python regex

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