import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "([\"'])\\s*(SELECT)(?:\\s+.*)?\\s+(FROM)(?:\\s+.*)?\\1(?:[^\\w]|$)";
final String string = " SELECT * FROM tbl -- no match - not in a string\n"
+ " \"SELECT * FROM tbl\" -- matches - in a double-quoted string\n"
+ " 'SELECT * FROM tbl;' -- matches - in a single-quoted string\n"
+ " 'SELECT * FROM it's -- no match - letter after end quote\n"
+ " \"SELECT * FROM tbl' -- no match - quotation marks don't match\n"
+ " 'SELECT * FROM tbl\" -- no match - quotation marks don't match\n"
+ " \"select * from tbl\" -- no match - keywords not upper case\n"
+ " 'Select * From tbl' -- no match - still not all upper case\n"
+ " \"SELECT col1 FROM\" -- matches - even though no table name\n"
+ " ' SELECT col1 FROM ' -- matches - as above with more whitespace\n"
+ " 'SELECT col1, col2 FROM' -- matches - with multiple columns";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
final Matcher matcher = pattern.matcher(string);
while (matcher.find()) {
System.out.println("Full match: " + matcher.group(0));
for (int i = 1; i <= matcher.groupCount(); i++) {
System.out.println("Group " + i + ": " + matcher.group(i));
}
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html