Google gives thousand of answers depending on what you want to match exactly, without example of what should match and what shouldn't, it is complicated to find the regex that fit your needs.
Try:
^((https?:[/][/])?(\w+[.])+com|((https?:[/][/])?(\w+[.])+com[/]|[.][/])?\w+([/]\w+)*([/]|[.]html|[.]php|[.]gif|[.]jpg|[.]png)?)$
from
REGEX for validating URL[
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Just a few interesting links to help building and debugging RegEx.
Here is a link to RegEx documentation:
perlre - perldoc.perl.org[
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Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[
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Expresso Regular Expression Tool[
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RegExr: Learn, Build, & Test RegEx[
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This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx:
Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[
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