Optimization of the Regex?

Question

Hi guys I am new to the regex for some patterns matching i have wrote the regex but it is very lengthy regex so i was hoping that any one can help me optimize it ?

My REGEX-->

(T)(\d{9})(T)(\s{0,19}\d{0,19}\s{0,19}[0-9DO ]\d{0,19}\s{0,19}[OD0-9 ]\s{0,19}\d{0,19}\s{0,19}\d{0,19}[0-9D ]\d{0,19})(O)(\s{0,5}\d{0,19})\b

Pattern I want to match -->

T062102098T0741 0361212401O
T011900571T 000007250107O1274
T065000090T203 93 5797 9O 4037  
T325170628T0108626004D18O01054
T071108452T    42D896D5O 3587 
T041211609T 01D1270DD4O 2721
T021407912TO9196D00580D6O 7106
T081219108T O45D936D4O 3155
T074909988T O022D853 6O 1340

Pattern I am avoiding -->

T071904779T154505122619 2051
T065000090T000 32 493O9O 11007

So any help would be great .Thanks in advance.

Answer 1

Your RegEx is fine, rather it could be simplified (perhaps optimized) as below:

(?x)
   (
      (?:T\d{9})
      (?:T\s*\d{0,19}\s*[0-9DO ]\d{0,19}\s*[OD0-9 ]\s*\d{0,19}\s*\d{0,19}[0-9D ]\d{0,19})
      (?:O\s*\d{0,19})
      \b
   )

One thing I have found in your RegEx, is unnecessary use of (...). Moreover, using \s{0,19} or \s{0,5} could be simply written as \s*. The last one is better, only if you're not restricted to use of 0-19 times or 0-5 times.