Attempting to come up with a regex pattern that will allow the entry of the specified input into an HTML input field:
^[^1-9]{0,1}[0-9\\s-\\/]*$
Unfortunately, with the above regex, I am unable to delete the initial 0...
^0[0-9\\s-\\/]*$"
Include a non-capturing group (?:...) to encompass all content between the characters ^ and $, then apply the ? operator (permitting zero or one occurrences):
^(?:0[0-9\\s-\\/]*)?$
^(?:0[0-9 \\/-]*|)$
This regular expression pattern allows for the input of empty strings or strings that start with '0'. Feel free to use this in your code. For a demonstration, you can check out the link below.
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