RegEx

For news filters and for sorting criteria you can use regular expressions. However, regular expressions are a science as it, so we just try to explain the concept by examples. Enter without apostrophe.

Regular Expression	String that match for the regular expression
"A5"   (no blank)	A5, A51, A556, OutA5, A555
"A5 "   (blank at the end)	A5, OutA5, InA5
"[A-Z]5"	A5, B5, C5, D5, ... Z5, A5Out, Z5In
"[A-Z]{1-3}5 " (blank at the end)	A5, AA5, BAB5, B5, BB5, AB5, AAA5, ..., ZZZ5
"[A-Z][0-9] " (blank at the end)	A1, A2, A3, ..., A9, B1, ..., B9, Z1, ... , Z9
"[A-Z][0-9] ]{1-3} " (blank at the end)	A1, A2, A3,...,A999, B1,...,B999, Z1,..., Z999
"\bA5\b"	A5  (\b represents a word boundary)
"\b15\b"	15 (but not 215, 152, 1215, 1515, A15, etc.)

For more info you will find several tutorials in the web, e.g here.