how to match names whin one group is not present in regex-CodePudding

I am stuck with following regex. my intention is to match following

abc_123_v1_f1_t21 
12c_1sdsd_f1_t1 
Android_v1_t21

regex i am trying is

_(v[1-9]{1,3}\d?_f[1-9]{1,3}\d?_t[1-9]{1,3}\d?)(?!\d)

I am not able to get regex match if my names doesn't contains squence (v_f_t). how to get regex match when i have pattern like without v or f or t ATLEAST two should be present. v_t or f_v or f_t or v_f_t or f_t_v etc

if I give adcg_f1_t1 it should match

if I give adcg_v2_f1 it should match

if I give adcg_v2_t12 it should match

How to do this ?

CodePudding user response：

To match strings that contain at least two of the substrings _v, _f, and _t, you can use the following regular expression:

.*(?:_v|_f|_t).*(?:_v|_f|_t).*

This regular expression uses the .* pattern to match any number of characters before and after the substrings _v, _f, and _t. The (?:_v|_f|_t) pattern matches either _v, _f, or _t, and the .* pattern that follows it matches any number of characters. The .* patterns and (?:_v|_f|_t) patterns are repeated to match at least two of the substrings _v, _f, and _t.

For example, the regular expression will match the following strings:

abc_123_v1_f1_t21 12c_1sdsd_f1_t1 Android_v1_t21 adcg_f1_t1 adcg_v2_f1 adcg_v2_t12 However, it will not match the string abc_123, since it does not contain at least two of the substrings _v, _f, and _t.

Here is an example of how you can use this regular expression in Python:

import re

pattern = r'.*(?:_v|_f|_t).*(?:_v|_f|_t).*'
string = 'abc_123_v1_f1_t21'

if re.match(pattern, string):
    print('Match found!')
else:
    print('Match not found.')

CodePudding user response：

You can use

(?:_[vft][1-9]{1,3}\d?){2,3}(?!\d)

See the regex demo.

Details:

(?:_[vft][1-9]{1,3}\d?){2,3} - two or three occurrences of
- _ - an underscore
- [vft] - v/f/t
- [1-9]{1,3} - one, two or three non-zero digits
- \d? - an optional digit
(?!\d) - no digit allowed immediately on the right.