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sathishsfdcsathishsfdc 

how to check for '' in apex

String s = '\'';
system.debug('s contains single quote='+s.contains('\''));
String s2 = '"';
system.debug('s2 contains double quote='+s2.contains('"'));
String s3 = '\\';
system.debug('s3 contains backslash='+s3.contains('\\'));


String s4 = '''';
system.debug('s2 contains double quote='+s2.contains(''''));

The attachement would give more details....thanks
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Amit Chaudhary 8Amit Chaudhary 8
Please try below code. 
String s = '\'';
system.debug('s contains single quote='+s.contains('\''));
String s2 = '"';
system.debug('s2 contains double quote='+s2.contains('"'));
String s3 = '\\';
system.debug('s3 contains backslash='+s3.contains('\\'));


String s4 = '\'\'';
system.debug('s4 single quote quote='+s2.contains('\'\''));

String s5 = '""';
system.debug('s5 contains double quote='+s2.contains('""'));
User-added image

Let us know if this will help you

THanks
Amit Chaudhary