Python remove dynamic substring from string

Question

I need to remove dynamic substring from string. e.g.:

Item value1="001" value2="abc" value3="123xyz"

and i need output:

Item value1="001"  value3="123xyz"

I mean I need remove value2="abc". value2 is an unique element and can be placed anywhere in original string. "abc" is dynamic variable and can have various length. What is the fastest solution of this problem? Thank you.

Do you really need the fastest solution? Because writing custom C code is going to beat any regex or str-method solution, even if only by a few nanoseconds, but does that actually matter? — abarnert
– abarnert, Commented Jun 26, 2018 at 19:56

whackamadoodle3000 · Accepted Answer · 2018-06-26 19:59:03Z

1

You could try a list comprehension

a='Item value1="001" value2="abc" value3="123xyz"'
print(' '.join([e for e in a.split(" ") if not e.startswith('value2="')]))

edited Jun 26, 2018 at 19:59

answered Jun 26, 2018 at 19:57

whackamadoodle3000

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1 Comment

Haleemur Ali Over a year ago

not e.startswith('value2=') should be a little faster in this approach

Haleemur Ali · Accepted Answer · 2018-06-26 20:03:06Z

1

regex should be pretty fast in this case:

import re
p = re.compile(r'value2="\w+"\s?')
re.sub(p, '', 'Item value1="001" value2="abc" value3="123xyz"')

the above works assuming the value for value2 has only alphabets (i.e. no digits or space-like charaters

edited Jun 26, 2018 at 20:03

answered Jun 26, 2018 at 19:55

Haleemur Ali

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