How to map array with Python

Question

I have this Python code, I want to map the array of regex strings, to compiled regexes, and I need to create a function that checks to see if a certain line of texts matches all the given regular expressions. But I suck at Python and only know JS and Java.

#sys.argv[2] is a JSON stringified array

regexes = json.loads(sys.argv[2]);

#need to call this for each regex in regexes
pattern = re.compile(regex)

def matchesAll(line):
    return True if all line of text matches all regular expressions

In JS, what I want looks like:

// process.argv[2] is a JSON stringified array
var regexes = JSON.parse(process.argv[2])
                 .map(v => new RegExp(v))

function matchesAll(line){
     return regexes.every(r => r.test(line));
 }

Can somehow help me translate? I was reading about how to do mapping of arrays with Python and I was like huh?

6502 · Accepted Answer · 2016-12-31 06:39:10Z

2

To compile all expressions you can simply use

patterns = map(re.compile, regexs)

and to do the check:

def matchesAll(line):
    return all(re.match(x, line) for x in patterns)

answered Dec 31, 2016 at 6:39

6502

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2 Comments

Alexander Mills Over a year ago

do I have to "import all"?

Mohammad Yusuf Over a year ago

@AlexanderMills No. It's builtin function.

Mohammad Yusuf · Accepted Answer · 2016-12-31 09:35:54Z

1

You can try something like this:

regexes = [re.compile(x) for x in json.loads(sys.argv[2])]

def matchesAll(line):
    return all([re.match(x, line) for x in regexes])

Test Example:

import re

regexes = [re.compile(x) for x in ['.*?a.*','.*?o.*','.*r?.*']]

def matchesAll(line):
    return all([re.match(x, line) for x in regexes])

print matchesAll('Hello World aaa')
print matchesAll('aaaaaaa')

Output:

True
False

edited Dec 31, 2016 at 9:35

answered Dec 31, 2016 at 6:05

Mohammad Yusuf

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1 Comment

Alexander Mills Over a year ago

thanks, I will move on to this, I will post an answer of what I have

Alexander Mills · Accepted Answer · 2016-12-31 06:40:19Z

0

This is what I have, I hope it's right

regex = json.loads(sys.argv[2]);

regexes=[]

for r in regex:
    regexes.append(re.compile(r))

def matchesAll(line):
    for r in regexes:
        if not r.search(line):
            return False
    return True

I will try @MYGz's answer, the lambda syntax is pretty foreign to me.

edited Dec 31, 2016 at 6:40

answered Dec 31, 2016 at 6:15

Alexander Mills

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