Pattern not surrounded by numbers or alphanumeric characters
I would like to find some words not surrounded by any numbers or alphanumeric characters or not surrounded by anything. So if I am looking for Foo123 I would like to get this result
="Foo123"; =>TRUE
barFoo123; =>FALSE
Foo123 =>TRUE
BarBar123Foo123Bar; =>FALSE
;Foo123 =>TRUE
I just built this expression:
(^[^0-9a-zA-Z]?)WORDTOFIND([^0-9a-zA-Z]?$)
I was sure I was right, but when I use it like this:
if (Regex.IsMatch(line, string.Format(@"(^[^0-9a-zA-Z]?){0}([^0-9a-zA-Z]?$)",snCode)) )
{
}
This does not work. What am I doing wrong?
0
bAN
source
to share
2 answers
You are mainly looking for
(?<![a-zA-Z0-9])Foo123(?![a-zA-Z0-9])
This uses lookahead and lookbehind to make sure the alphanumeric character doesn't exist before or after Foo123
. This assumes ASCII.
+3
Joey
source
to share
The following matches the lines you DO NOT want, so !Regex.IsMatch()
(^([0-9a-zA-Z])+{0}.*)|(.*{0}([0-9a-zA-Z])+)
0
tilish
source
to share