Below I have the following regex:
alphanumeric = compile['^[\w\d ]+$']
I'm running the current data against this regex:
Tomkiewicz Zigomalas Andrade Mcwalters
I have a separate regex to identify alpha characters only, yet the data above still matches the alphanumeric criteria.
Edit: How do I stop the only alpha data matching with the regex above?
asked Apr 10, 2014 at 19:18
5
Description: It can be in two forms:
- Starts with numeric chars then there should be some chars, followed by any number of alpha-numeric chars are possible.
- Starts with alphabets, then some numbers, followed by any number of alpha-numeric chars are possible.
Demo:
>>> an_re = r"[\d+[A-Z]]|[[A-Z]+\d][\dA-Z]*"
>>> re.search[an_re, '12345', re.I] # not acceptable string
>>> re.search[an_re, 'abcd', re.I] # not acceptable string
>>> re.search[an_re, 'abc1', re.I] # acceptable string
>>> re.search[an_re, '1abc', re.I]
answered Apr 10, 2014 at 19:31
Grijesh ChauhanGrijesh Chauhan
55.7k19 gold badges135 silver badges199 bronze badges
1
Use a lookahead to assert the condition that at least one alpha and at least one digit are present:
[?=.*[a-zA-Z]][?=.*[0-9]]^[\w\d ]+$
The above RegEx utilizes two lookaheads to first check the entire string for each condition. The lookaheads search up until a single character in the specified range is found. If the assertion matches then it moves on to the next one. The last part I borrowed from the OP's original attempt and just ensures that the entire string is composed of one or more lower/upper alphas, underscores, digits, or spaces.
answered Apr 10, 2014 at 19:36
tenubtenub
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