starts with number and ends with string or number starts with +ve, -ve or decimal number

Rackerrank regex prepare

Matches the image mime types. E.g image/png, image/jpeg, etc.

Python does not support conditionals using lookaround, even though Python does support lookaround outside conditionals. (?(?=regex) then|else) is illegal in python (?=regex)then|(?!regex)else - this works. madness details in the test strings

reverses order when code is followed by comments (comments prepended with ## )

hi

select 09|10

Regular expression to match all C style comments.

Not Funny vs Funny - need to match for both cases

匹配md图片

匹配图片链接

find tag, but you can adapt to other tag

used to extract doi

Regular exporession for Nr2000 validation

It won't recognize if the local-part is just one character like t@somedomain.com

find any standalone, non-white space character

select subdomain

Description This is a simple Regular Expression for Mobile Numbers. Still needs more work. It currently supports the following formats: aaaaaaaaaa

select的操作