Python — check if a string contains Cyrillic characters

Suggesting a method, faster than the discussed ones here.

Approach#1:

len("экономия3r4".encode("ascii", "ignore")) > len ("экономия3r4")

246 ns ± 7.76 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)

Would print "True" if there is a Cyrillic character

Approach#2:

Discussed in earlier post by Max

import re

def has_cyrillic(text):
    return bool(re.search('[а-яА-Я]', text))

has_cyrillic("экономия3r4")

929 ns ± 20.6 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)

You can use a regular expression to check if a string contains characters in the а-я, А-Я range:

import re 

def has_cyrillic(text):
    return bool(re.search('[а-яА-Я]', text))

---

Alternatively, you can match the whole Cyrillic script range:

def has_cyrillic(text):
    return bool(re.search('[\u0400-\u04FF]', text))

This will also match letters of the extended Cyrillic alphabet (e.g. ё, Є, ў).

regex supports Unicode properties, along with a few short forms.

>>> regex.search(r'\p{IsCyrillic}', 'Hello, world!')
>>> regex.search(r'\p{IsCyrillic}', 'Привет, world!')
<regex.Match object; span=(0, 1), match='П'>
>>> regex.search(r'\p{IsCyrillic}', 'Hello, wёrld!')
<regex.Match object; span=(8, 9), match='ё'>