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Learn Javascript: Working with Strings - Includes substring - test()
Learn Javascript: Working with Strings: Check substring- includes()
Learn Javascript: Working with Strings- Check substring : indexOf()
Learn Javascript: Working with Strings - Insert substring - slice
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Last Updated: June 7, 2026
Background of Learn Javascript Working With Strings Includes Substring Test

[Using Looping] A simple program to read an email and validate against the format A(A/9/_)...(A/9/_)..A.com where A is ... 00:00:00 intro 00:00:28 .charAt() 00:01:34 .indexOf() 00:02:03 .lastIndexOf() 00:02:15 .length 00:02:40 .trim() 00:03:13 . Join my channel to get access to perks: Hello All ...
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