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Regex checking username

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dhupee answered on April 7, 2021 Popularity 8/10 Helpfulness 4/10

answer Regex checking username

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Regex checking username

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#!/usr/bin/env python3

import re

def validate_user(username, minlen):
    """Checks if the received username matches the required conditions."""
    if type(username) != str:
        raise TypeError("username must be a string")
    if minlen < 1:
        raise ValueError("minlen must be at least 1")
    
    # Usernames can't be shorter than minlen
    if len(username) < minlen:
        return False
    # Usernames can only use letters, numbers, dots and underscores
    if not re.match('^[a-z0-9._]*$', username):
        return False
    # Usernames can't begin with a number
    if username[0].isnumeric():
        return False
    return True

Popularity 8/10 Helpfulness 4/10 Language python

Source: raw.githubusercontent.com

Tags: python regex

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Contributed on Jul 06 2022

dhupee

0 Answers Avg Quality 2/10

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match username regex

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/^[a-zA-Z0-9_-]{3,16}$/

Popularity 10/10 Helpfulness 10/10 Language whatever

Source: Grepper

Tags: match matc

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Contributed on Oct 24 2022

Mehedi Islam Ripon

0 Answers Avg Quality 2/10

regex for username

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# works in most newer browsers
^(?=.{8,20}$)(?![_.])(?!.*[_.]{2})[a-zA-Z0-9._]+(?<![_.])$
 └─────┬────┘└───┬──┘└─────┬─────┘└─────┬─────┘ └───┬───┘
       │         │         │            │           no _ or . at the end
       │         │         │            │
       │         │         │            allowed characters
       │         │         │
       │         │         no __ or _. or ._ or .. inside
       │         │
       │         no _ or . at the beginning
       │
       username is 8-20 characters long

# works in all browsers, but does the same as the above RegEx
^(?=[a-zA-Z0-9._]{8,20}$)(?!.*[_.]{2})[^_.].*[^_.]$

Popularity 9/10 Helpfulness 7/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Jul 08 2021

Anxious Alligator

0 Answers Avg Quality 2/10

regex for username

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let username = '';
username = username.replace(/\s/g,'_');
username = username.replace(/\-/g,'.');
username = username.match(/[a-zA-Z0-9\.\s]+/g).join('_');

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Apr 07 2021

julesgrc0

0 Answers Avg Quality 2/10

Regex checking username

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