正则表达式-如何从Java中的所有sql语句中排除这种sql？

Question

how to exclude this kind of sql from all sql statements: alter table ... column ...

I wrote a regex but it doesn't work in java: alter\\s+table\\s+.*(?<!\\s+column\\s+.*)

Answer 1

I don't see why you need a lookaround, just use this pattern:

alter\s+table\s+.*\bcolumn\b.*

Code snippet:

String sql = "ALTER TABLE table_name DROP COLUMN column_name;";
if (sql.matches("(?i:alter\\s+table\\s+.*\\bcolumn\\b.*)")) {
    System.out.println("not allowed");
}
else {
    System.out.println("allowed");
}

Demo

Answer 2

By Simply Replacing all the keywords with '' or ' '

Code :

String sql = "ALTER TABLE table_name DROP COLUMN column_name";

sql.replace("alter").('');

sql.replace("column").(' ');