1. The existing numbers to be entered are: 01,03,05,07,09,11,13,15...numbers arranged in this way.
2. There is an input box in which only such numbers are allowed to be entered, separated by commas. How to write the regular expression.
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小伙看你根骨奇佳，潛力無限，來學PHP伐。
If the strict requirement is to increase the sequence, regularization is difficult to implement.
This is the previous answer, please refer to it.
Continuous ascending and descending letters or numbers
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