Hi. I have the specification to build the following numeric string: 981890or981891 followed by 10 digits or atmost 4 seperators(.,-,:)+ 10 digits. So the example matching this should be: 1. 9818902365894598 2.9818 9021 2454 2170 3.9818-9145-6896-2146 The regex I am trying is as follow: 

9818[\D]?9[0|1][\D]?\d{2}[\D]?\d{4}[\D]?\d{4}

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But this looks inefficient. Please suggest:

In reply to Regex Help by gautamparimoo

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