Capture Substring from list elements-CodePudding

Having list of strings as below:

    ['Communcation between: ACC_Verkehrssinn and SG_ACC_22\nUsing testing method: MinMaxMid', 
     'Communcation between: ACC_Status_Laengs and SG_ACC_22\nUsing testing method: MinMaxMid',
     'Signal Name:WLA_FC1_Obj10angleLeft\nCommuncation between: SG_WLA_FC1_Obj01_30 and 
      SG_WLA_FC1_Obj01_30\nUsing testing method: MinMaxMid', 
     'Signal Name:WLA_FC1_Obj10angleRight\nCommuncation between: SG_WLA_FC1_Obj01_30 and 
      SG_WLA_FC1_Obj01_30\nUsing testing method: MinMaxMid']

Want to read list elements which contains 'Signal Name:' and capture its value. Here in this case output should be:

WLA_FC1_Obj10angleLeft
WLA_FC1_Obj10angleRight

Any help is appreciated.

CodePudding user response：

We can use a list comprehension here:

inp = ['Communcation between: ACC_Verkehrssinn and SG_ACC_22\nUsing testing method: MinMaxMid', 'Communcation between: ACC_Status_Laengs and SG_ACC_22\nUsing testing method: MinMaxMid', 'Signal Name:WLA_FC1_Obj10angleLeft\nCommuncation between: SG_WLA_FC1_Obj01_30 and SG_WLA_FC1_Obj01_30\nUsing testing method: MinMaxMid', 'Signal Name:WLA_FC1_Obj10angleRight\nCommuncation between: SG_WLA_FC1_Obj01_30 and SG_WLA_FC1_Obj01_30\nUsing testing method: MinMaxMid']
output = [re.search(r'Signal Name:\s*(\S )', x).group(1) for x in inp if 'Signal Name:' in x]
print(output)

This prints:

['WLA_FC1_Obj10angleLeft', 'WLA_FC1_Obj10angleRight']

CodePudding user response：

Try this approach without regex:

mylist = ['Communcation between: ACC_Verkehrssinn and SG_ACC_22\nUsing testing method: MinMaxMid', 
     'Communcation between: ACC_Status_Laengs and SG_ACC_22\nUsing testing method: MinMaxMid',
     'Signal Name:WLA_FC1_Obj10angleLeft\nCommuncation between: SG_WLA_FC1_Obj01_30 and SG_WLA_FC1_Obj01_30\nUsing testing method: MinMaxMid', 
     'Signal Name:WLA_FC1_Obj10angleRight\nCommuncation between: SG_WLA_FC1_Obj01_30 and SG_WLA_FC1_Obj01_30\nUsing testing method: MinMaxMid']

values = []
for mystr in mylist:
    if mystr.find("Signal Name:") != -1:
        mystr = mystr[12:]
        index = mystr.find("\n")
        mystr = mystr[:index]
        values.append(mystr)

print(values)

Output:

['WLA_FC1_Obj10angleLeft', 'WLA_FC1_Obj10angleRight']

The output gets saved in values list. You may access the individual elements to get what you want.

CodePudding user response：

We can combine all strings into one large string, and use re.findall() to search for all words between the word "Signal Name:" and "\n"

Hope this helps.

import re
strings = ['Communcation between: ACC_Verkehrssinn and SG_ACC_22\nUsing testing method: MinMaxMid', 
     'Communcation between: ACC_Status_Laengs and SG_ACC_22\nUsing testing method: MinMaxMid',
     'Signal Name:WLA_FC1_Obj10angleLeft\nCommuncation between: SG_WLA_FC1_Obj01_30 and SG_WLA_FC1_Obj01_30\nUsing testing method: MinMaxMid', 
     'Signal Name:WLA_FC1_Obj10angleRight\nCommuncation between: SG_WLA_FC1_Obj01_30 and SG_WLA_FC1_Obj01_30\nUsing testing method: MinMaxMid']
all_strings = ''.join(strings)
print(re.findall("Signal Name:(.*)\n", all_strings))

Output

['WLA_FC1_Obj10angleLeft', 'WLA_FC1_Obj10angleRight']