^[a-zA-Z]{1}[a-zA-z0-9]{1,15}$ Test input : nikhil11 (valid) 11nikhil (invalid)

Regex to validate and get info from email string

grabs the ID for the regex101.com permalink to code

California Medicaid (Medi-Cal) ID Validator Verifies a series of 8 Digits, 1 Char, and 5 Digits together.

Grep the access_token from response returned by bitbucket's oauth access_token endpoint. For example: curl -s https://bitbucket.org/site/oauth2/access_token -d grant_type=client_credentials -u KEY:SECRET `

unicode, IDN, usual domains