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@DEVS@DEVS 

Why does this RegEx pattern not working in Salesforce ?

Why does this RegEx pattern not working in Salesforce ?

pattern myPattern = pattern.compile('@(microsoft|ms|microsoftsurface|msstore).com');
System.debug(myPattern.matcher('aba@ms.com').matches());

I tested it in https://regexr.com/ and it works !
Best Answer chosen by @DEVS
Alain CabonAlain Cabon
find() instead of matches(). 
pattern myPattern = pattern.compile('@(microsoft|ms|microsoftsurface|msstore).com');
System.debug(myPattern.matcher('aba@ms.com').find());

pattern myPattern = pattern.compile('.+@(microsoft|ms|microsoftsurface|msstore).com');
System.debug(myPattern.matcher('aba.com').matches());

find()
Attempts to find the next subsequence of the input sequence that matches the pattern. This method returns true if a subsequence of the input sequence matches this Matcher object's pattern.

matches()
Attempts to match the entire region against the pattern.

https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes_pattern_and_matcher_matcher_methods.htm#apex_classes_pattern_and_matcher_matcher_methods