Without regex package

How can I check a string that belongs to a grammar or not without importing regex package in my java program.
If Anybody have good idea please give .

I am planning to developing an editor tool for java programming because of my interest. Before that I want to learn lexiacal analyzing in java programming. So I wrote a token recognizing code in java ( It will recognize keywords, identifier, constants, operator, special symbols).
For that I used java.util.regex package( Pattern and Match) classes. But I got Lot of bugs and less feasibilty in my coding. It is not working properly. Sometimes it recognize a keyword as a identifier sometimes as a special symbol. So I want to know Is there any possibilities to write a token recognize program without using a regex package.

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