Allow only two dots email address, for username.group@domain.tld

Complete (recursive) JSON validation regular expression.

Find nonspaced operators with capturing groups to reformat correctly.

Parses @FOO=BAR, @FOO, and @FOO{"JSON":"OBJECT"} to be used in REDCap action tags for passing parameters to functions.

remove the last char from a string. Replace 'e' with the char to remove.

JSON object string \r\n & \" replace regex

From 1970 to 2015 Replace: (\d{4})$ for (19[7-9]\d|200-1)$

1 digit 1 lower case 1 upper case 1 special character (no-space) 8-20 length

^([A-E])([A-C])([0-2])(\d)([0-5])(\d)([B])(\d{6})([A-Z0-9]{2})(\d{3})$

Simple tel regex