definition regular expression code example
Example 1: regular expression
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https://regex101.com/
Example 2: regular expression
|\b0*([a-zA-Z1-9][a-zA-Z0-9]*|0)\b$
One of my favorite regex testers:
https://regex101.com/
|\b0*([a-zA-Z1-9][a-zA-Z0-9]*|0)\b$