package main
import (
"regexp"
"fmt"
)
func main() {
var re = regexp.MustCompile(`(?m)(["'])\s*(SELECT)(?:\s+(?:(?!\1).)*)?\s+(FROM)(?:\s+(?:(?!\1).)*)?\1(?:[^\w]|$)`)
var str = ` SELECT * FROM tbl -- no match - not in a string
"SELECT * FROM tbl" -- matches - in a double-quoted string
'SELECT * FROM tbl;' -- matches - in a single-quoted string
'SELECT * FROM it's -- no match - letter after end quote
"SELECT * FROM tbl' -- no match - quotation marks don't match
'SELECT * FROM tbl" -- no match - quotation marks don't match
"select * from tbl" -- no match - keywords not upper case
'Select * From tbl' -- no match - still not all upper case
"SELECT col1 FROM" -- matches - even though no table name
' SELECT col1 FROM ' -- matches - as above with more whitespace
'SELECT col1, col2 FROM' -- matches - with multiple columns
"SELECT 'c' FROM 'tbl'" -- matches - with identifier names quoted
"SELECT "c" FROM" -- no match - same quotation marks for identifier
"SELECT * FROM" "quoted" -- matches - with another unmatched quoted string
`
for i, match := range re.FindAllString(str, -1) {
fmt.Println(match, "found at index", 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 Golang, please visit: https://golang.org/pkg/regexp/