c# - Regex to check whether "and,or,not,and not" in a word? -

i have seneario have check word contains "and,or,not,and not" regex have created fails. can body provide me right regex this?

the regex have created this

  regex objalphapattern = new regex(@"^[not|and not|and|not]");   if(objalphapattern.ismatch(searchterm))   {    //// code   }

but returns true.

i have tried word "pen , pencil" , "pen pencil" both returning true.. can help in providing right regex?

you're starting begin anchor. if don't want check if happens @ origin of string shouldn't have ^.

also, using [] when should using (). in case don't need (). [] indicates character class. don't need that.

regex objalphapattern = new regex("\b(and|not)\b"); if(objalphapattern.ismatch(searchterm)) { //// code }

that should job.

i highly recommend the regex coach help build regex.

i highly recommend http://www.regular-expressions.info/ reference.

edit: sense should point out don't need object instance.

if(system.text.regularexpressions.regex.ismatch(searchterm, "\b(and|not)\b")) { //// code }

you can utilize static method.

that's point tim:

"\band\b|\bnot\b"

another point stema:

"\b(and|not)\b"

c# regex

JC