I am trying to extract the 9 digit number that appears between the lookbehind values (Form & FMLA). This is the logic I am using to target my lookbehinds: (?<=Form)([\S\s]*)(?<=FMLA). Can I add another part to extract the 9 digit number? Any help would be greatly appreciated. Thanks!

Form ( For Medical Leaves of Absence ) DO NOT return this document with your original request for a leave of absence . Please email or fax this document to the HR Service Center 5 - 7 days before the date you're expected to return to work .

SECTION I : To be completed by Associate Associate's Name : Associate's Job Title : Associate ID ; Location / Store # James Doe Garden Associate 123456789 SECTION II : To be completed by a health care provider treating the associate / patient : Your patient is currently on leave of absence . Answer , fully and completely , all applicable parts . Several questions seek a response as to the frequency or duration of a condition , treatment , etc. Your answer should be your best estimate based upon your medical knowledge 1 , experience , and examination of the patient . Be as specific as you can ; terms such as "" lifetime , "" or "" indeterminate "" may not be sufficient to determine FMLA coverage .

CodePudding user response：

You can use

(?s)(?<=Form.*?)\d{9}(?=.*?FMLA)

If you need to make sure there are no other digits enclosing the nine-digit substring, use

(?s)(?<=Form.*?)(?<!\d)\d{9}(?!\d)(?=.*?FMLA)

See the .NET regex demo. Details:

• (?s) - a RegexOptions.Singleline inline modifier flag that makes . match across line boundaries
• (?<=Form.*?) - a positive lookbehind that requires From and then any zero or more chars, as few as possible, immediately to the left of the current location
• \d{9} - nine digits
• (?=.*?FMLA) - a positive lookahead that requires any zero or more chars, as few as possible, and then FMLA substring.

CodePudding user response：

You can add this construction to your regex to match 9 consecutive digits:

([0-9]{9})

0-9 mean any digit between 0 and 9
9 in curly brackets mean repeat the previous 9 times

The final regex expression should be:

(?<=Form)([\S\s]*)([0-9]{9})(?<=FMLA)