import Foundation
let pattern = #"(?:(?i)WHERE|AND|OR) \(?([a-zA-Z0-9]+)"#
let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines)
let testString = ##"""
return all strings (a-zA-Z0-9) of any length that
start right after one of the following expressions: "WHERE ", "AND ", "OR ", "WHERE (", "AND (", "OR (" and
end right before one of the following expressions: "=", ">", "<", "LIKE", "NOT")
all these expressions should be case-insensitive.
I was playing around with the following online regex-tester: https://www.phpliveregex.com/#tab-preg-match-all. However, the closest I got was this, as I dont know how to get multiple matches:
preg_match_all('/^[where|and|or|\(]* ([a-zA-Z0-1]*)[ |=|<|<=|>|>=|or|in]*.*$/', $input_lines, $output_array);
Some example SQL-queries:
SHOULD RETURN
WHERE var1=1 AND var2=1 => var1; var2
WHERE var2 IN (1, 2, 3) OR var3=2 => var2; var3
WHERE (var4 like '%test%' and var5 NOT LIKE '%test%') => var4; var5
WHERE var6 = 'test' AnD var7='test2' => var6; var7
"""##
let stringRange = NSRange(location: 0, length: testString.utf16.count)
let matches = regex.matches(in: testString, range: stringRange)
var result: [[String]] = []
for match in matches {
var groups: [String] = []
for rangeIndex in 1 ..< match.numberOfRanges {
let nsRange = match.range(at: rangeIndex)
guard !NSEqualRanges(nsRange, NSMakeRange(NSNotFound, 0)) else { continue }
let string = (testString as NSString).substring(with: nsRange)
groups.append(string)
}
if !groups.isEmpty {
result.append(groups)
}
}
print(result)
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 Swift 5.2, please visit: https://developer.apple.com/documentation/foundation/nsregularexpression