In Dired mode, M-x occur .*\.html$ whould show only ".html" files.

Match feet and inches, including fractions or decimals

Replace all the characters but digits and minus sign.

Get numbers formated as dates with dots and Group them by year, month and day.

check if a given url is for a img type of jpeg, jpg, bmp, png

check if a given url is for a img type of jpeg, jpg, bmp, png

This will take the QT field from Exim mail routing logs and create QT_seconds, QT_minutes, QT_hours and QT_int

Matches a number sequence separated by a comma: 1234,1234,1234,1234 won't match: Letters If sequence ends with a comma...