Micropython - Regex

Question

I have the following string: ['', '+VZWRSRP: 64,6300,-101.70', '', 'OK', '']

Where I try to put everything after the second comma into the variable PCI, everything after the 3rd comma into variable earfcn and everything after the 4th comman into variable RSRP.

As start I wanted to test it with RSRP and the following regex command:

cellinfo = ['', '+VZWRSRP: 64,6300,-101.70', '', 'OK', '']
rsrp = re.search('-(.+?)\'', cellinfo)

But somehow I can't get it working.

What's a good solution to achieve this?

Nathan · Accepted Answer · 2018-04-05 10:56:48Z

1

I missed that the question is specified for micropython, I haven't worked with that, this answer works in normal python

import re
input_string = ", '+VZWRSRP: 64,6300,-101.70', '', 'OK', "
m = re.search(',.*?:(.*?),(.*?),(.*?),.*?,', input_string)
PCL = m.group(1)
earfcn = m.group(2)
RSRP = m.group(3)

returns:

PCL = 64
earfcn = 6300
RSRP = -101.70'

If you want the output to consist only out of values that could be translated to integers or floats:

part = ".*?(-*\d+\.*\d*).*?"
m = re.search(',.*?:{},{},{},.*?,'.format(part,part,part), input_string)

Will do the trick.

If your string is '+VZWRSRP: 64,6300,-101.70', use

part = ".*?(-*\d+\.*\d*).*?"
m = re.search('.*?:{},{},{}'.format(part,part,part), input_string)

edited Apr 5, 2018 at 10:56

answered Apr 4, 2018 at 13:40

Nathan

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10 Comments

newduino Over a year ago

It should be like this in the end: PCI = 64, Earfcn = 6300 and RSRP = 101.70. Therefore it's unfortunately not correct what you wrote.

newduino Over a year ago

Basically just 64 should be in variable pci, 6300 into variable earfcn and -101.70 into variable rsrp. But those values are all dynamic.

newduino Over a year ago

Code looks like this now: part = ".*?(-\d+\.*\d).*?" m = re.search(',.*?:{},{},{},.*?,'.format(part,part,part), lte.send_at_cmd('AT+VZWRSRP').split('\r\n')) pci = int(m.group(1)) earfcn = int(m.group(2)) rsrp = float(m.group(3)) but I get this error: Traceback (most recent call last): File "main.py", line 62, in <module> TypeError: can't convert 'list' object to str implicitly the output of lte.send_at_cmd('AT+VZWRSP') looks like this: ['', '+VZWRSRP: 64,6300,-101.70', '', 'OK', '']

Nathan Over a year ago

The problem is that you split your string into lists using: lte.send_at_cmd('AT+VZWRSRP').split('\r\n'). What does "lte.send_at_cmd('AT+VZWRSRP')" output?

newduino Over a year ago

Thats the output: +VZWRSRP: 64,6300,-103.20

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