Python Regex: How to match sub string of words

Question

I'd like to create regex to match if they're substring of commands.

Example: configure terminal

Match if have at least: conf t

I tried to use : r'conf(igure)?\\s*t(erminal)?' but it matched something like "conf txxxxx" as well. also, it's not matched "config t"

my questions is I'd like to create that match something like these.

Match: config ter configu term conf t

not matched: confgure tminal

if match optional, it's need to be in order.

Thanks!

Answer 1

A regex is not a very good solution, as it is not particularly suitable for such a test, and neither is it easy configurable, maintainable, and expandable.

Better is to write a separate function that tests a single input i against a possible match m and returns True if

1. len(i) >= minimum_length_required , and
2. as much as given from i matches that length from m .

This works for single-word entries:

def partialMatch(entry, full, minimum):
    return len(entry) >= minimum and entry == full[:len(entry)]

>>> print (partialMatch('con', 'configure', 4))
False
>>> print (partialMatch('config', 'configure', 4))
True
>>> print (partialMatch('confiture', 'configure', 4))
False

but it takes more work with multi-word commands because each separate word must be checked – and, presumably, there is a long list of possible commands. However, the general idea should be something like this:

def validate(entry, cmd_list):
    entry = entry.split()
    if len(entry) != len(cmd_list):
        return False
    for index,word in enumerate(entry):
        if not partialMatch(word, cmd_list[index].replace('#',''), cmd_list[index].find('#')):
            return False
    return True

where cmd_list contains a list of allowed entries and a # character matches the position of the minimum entry text. So you can do

>>> print (validate ('conf', ['conf#igure', 't#erminal']))
False
>>> print (validate ('conf t', ['conf#igure', 't#erminal']))
True
>>> print (validate ('configure t', ['conf#igure', 't#erminal']))
True
>> print (validate ('conf #', ['conf#igure', 't#erminal']))
False

(Of course you typically would not store the valid commands inside this call itself but in a longer list, and loop over it to find a valid command.)

Answer 2

Here is Example

s="conf fxxx "
if not s.find('conf t'):
    print('yes')
else:
    print('no')

Answer 3

只是在这里详述@ usr2564301注释，

import re pattern = r'conf(i(g(u(r(e)?)?)?)?)?\\st(e(r(m(i((n(a(l)?)?)?))?)?)?)?' text='config t' print(re.match(pattern, text))