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Instead of LIKE and ~, why only SIMILAR TO works when doing regex match with alternatives


Instead of LIKE and ~, why only SIMILAR TO works when doing regex match with alternatives

By : Skeptical
Date : November 19 2020, 03:01 PM
it fixes the issue LIKE supports pattern matching using _ for any single character and % for any sequence of characters so this:
code :
SELECT 'thomas' LIKE '%(h|x)%'
SELECT 'thomas' SIMILAR TO '%(h|x)%'
SELECT 'thomas' ~* '%(h|x)%'
SELECT 'thomas' ~* '(h|x)' -- alternation
SELECT 'thomas' ~* 'h|x'   -- alternation without an unnecessary grouping
SELECT 'thomas' ~* '[hx]'  -- or a character class


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RegEx to match two alternatives but nothing else

RegEx to match two alternatives but nothing else


By : Tao Lee
Date : March 29 2020, 07:55 AM
this will help I need to capture either
code :
(\d+\.\d+|\d+)
How to prevent regex from stopping at the first match of alternatives?

How to prevent regex from stopping at the first match of alternatives?


By : user1968521
Date : March 29 2020, 07:55 AM
wish of those help I think you're going to need to use three separate regexs and match on each of them. When you specify alternatives it considers each one a successful match and stops looking after matching one of them. The only way I can see to do it is to repeat the search with each of your alternatives in a separate regex. You can create an array or list of Match items and have each search add to the list if you want to be able to iterate through them later.
Regex in English works but a similar regex in a different langauge does not work

Regex in English works but a similar regex in a different langauge does not work


By : Alaa Salem
Date : March 29 2020, 07:55 AM
To fix this issue Testing 12/KMY(Naing)056503 against Regex (1[0-5]|[0-9])/[A-Z]{3}\(Naing\)[0-9]{6} returns true but testing ၁၂/ကမရ(နိုင်)ဝ၅၆၅ဝ၃ against (1[၀-၅]|[၀-၉])/[က-အ]{3}\(နိုင်\)[၀-၉]{6}. Why does this happen? , It's not matching because of two reasons:
Reason 1:
How to match alternatives with python regex

How to match alternatives with python regex


By : Rick Schokman
Date : March 29 2020, 07:55 AM
will be helpful for those in need You need to fix your alternation, it must be enclosed with a non-capturing group (?:JANE|MARY), and use a lazy quantifier with [\w\W] (that I would replace with .* and use re.DOTALL modifier to make the dot to also match line breaks):
code :
(?s)TOM\s*(.+?)\s*(?:JANE|MARY)
Regex returns no match in Dart but works in online regex testers

Regex returns no match in Dart but works in online regex testers


By : chandrakanth Thigull
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I have built a regex which should match valid HTTP headers. It works, sort of, on regexr: https://regexr.com/4pnk9, with regex ^([\w\-])+:(?!\s*$).+$. I am using the global, multi line and case insensitive flags (gim). , You may either use
code :
r"^([\w-])+:(?!\s*$).+$"
"^([\\w-])+:(?!\\s*\$).+\$"
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