Lexer pl/0 regulations, can identify the input string is in line with pl/0 rules

PL0compiler
...........\.classpath
...........\.project
...........\.settings
...........\.........\org.eclipse.jdt.core.prefs
...........\bin
...........\...\Lexor$idtype.class
...........\...\Lexor$opcode.class
...........\...\Lexor$oprcode.class
...........\...\Lexor$symtype.class
...........\...\Lexor.class
...........\...\main.class
...........\...\pro.txt
...........\in.txt
...........\src
...........\...\Lexor.java
...........\...\main.java
...........\...\pro.txt
...........\词法分析器-状态转换图.png

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