import Foundation
let pattern = #"\s(?:from|join)\s*(\[?[\S]+)\]?(?:\s?)(?:(?:as)?\s?)(?!(join|where|from|left|right|outer|inner|on))(\w*)"#
let regex = try! NSRegularExpression(pattern: pattern, options: .caseInsensitive)
let testString = ##"""
SELECT a.ACCTNO,
case [DCCDRID] when 'N/A' then 'N/A' else dbo.GETDocNames(DCCDRID) end AS [Specific Documents Needed],
a.CUSTRF,
b.[RLEXT#],
a.APPLCT,
a.SADDR1,
a.SADDR2,
a.SCITY,
a.SSTATE,
a.SZIP,
a.CFOReqstType
FROM (
SELECT a.ACCTNO,
a.CUSTRF,
a.MINNBR,
a.[GSE_NO] AS [FNMA#],
a.GSEPN AS [FNMA MBS Pool Number],
a.GSESN AS [FNMA Master Servicer Number],
a.APPLCT,
a.SADDR1,
a.SADDR2,
a.SCITY,
a.SSTATE,
a.SZIP,
a.RefreshRunDT AS [Request Date],
a.TRANDT AS [Paid Date],
a.OrgLnBal AS [Orig Loan Amt],
b.CustodianName,
a.FileDestName,
a.CSTSEQ,
a.CSTFileDest,
a.CSTRelCode,
a.CFOOrderReasonCode,
a.CFOReqstType,
a.DCCDRID
FROM [PRODLIB].[dbo].[DOCUS_SYS_REFRESH_CFO_DAILY] a
INNER JOIN tbl_DC_CLU_CUSTD b
ON a.CSTSEQ = b.CSTSEQ
WHERE a.CSTSEQ In (23,34,35,39,53,54)
) a
INNER JOIN DOCUS_PRODLIB_CLPREFAL b
ON a.ACCTNO = b.[RLNEW#]
WHERE a.CSTSEQ = 23
"""##
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