regular expression in java search

Question

How can I with regex find string "executeQuery" but not if whole string has "vo" or "Viewobject".

Examples:

ResultSet rs = ps.executeQuery(); --> CORRECT
super.executeQueryForCollection(object, object1, i); --> CORRECT
voOEPoDEStruktura.executeQuery(); --> WRONG
ViewObject.executeQuery(); --> WRONG

Is there a specific reason why this must be accomplished by a regular expression? — user
– user, Commented Jan 12, 2012 at 14:05

dogbane · Accepted Answer · 2012-01-12 14:02:24Z

3

You don't necessarily need a regex. You can use contains instead. Your condition would be:

str.contains("executeQuery") && !(str.contains("vo") || str.contains("Viewobject"))

answered Jan 12, 2012 at 14:02

dogbane

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3 Comments

user Over a year ago

+1. Remember: if at first you have a problem and then you decide to solve it using regular expressions, you will suddenly have two problems. Don't over-engineer.

ligerdave Over a year ago

a bit modification to make it faster !str.contains("vo") && !str.contains("Viewobject") && str.contains("executeQuery")

RokL Over a year ago

I don't know if that's faster. Provided that majority of lines contain none of these strings, let's examine what happens when parsing the random 50 char line: !str.contains("vo") && !str.contains("Viewobject") && 0str.contains("executeQuery") Scan 50 chars to find the string contains no vo, scan 50 chars to find the string contains no ViewObject, scan 50 chars to see if string contains executeQuery str.contains("executeQuery") && !(str.contains("vo") || str.contains("Viewobject")) Scan the line for executeQuery... and fail 99% of the time, and finish right there.

RokL · Accepted Answer · 2012-01-12 14:24:12Z

1

^(?!.*(?:vo|ViewObject)).*executeQuery.* is the regex which will match the specifications. I didn't use capturing groups because you didnt specify that you want to capture anything.

You should use the solution with contains because it's easier to understand.

answered Jan 12, 2012 at 14:24

RokL

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