The phrase "a pattern in which" is grammatically correct and can be used in written English.
It is commonly used to introduce a description or explanation of a recurring sequence of events or actions. Example: "There is a pattern in which the seasons change: winter turns to spring, spring to summer, summer to fall, and fall back to winter again."
Trawling through far-right sites, Wright recognised a pattern in which the author's name was used.
Flashbacks reveal a pattern in which Ida repeatedly kidnapped Victor from the foster homes in which he had been placed.
In many countries, social convention dictates a pattern in which males at marriage are slightly older than their spouses.
Catholic officials said such comments followed a pattern, in which victims of violent crimes were depicted as somehow complicit in the crimes committed against them.
Out of this African experience came three early novels -- Waldo" was the first -- setting a pattern in which travels and displacements were followed by literary echoes.
The murder set a pattern in which the couple would lure their victims, often on roadsides or at railway stations, by asking for help or directions.
He saw it as part of a pattern in which Sergeant Williams would contradict him, criticize him, ridicule him or bypass him altogether.
But Mr. Thompson said the contribution reflected a pattern in which Mr. Bloomberg used his money to woo supporters from mayors to community groups and muzzle potential critics.
Obama campaigners said her account of Tuzla was part of a pattern in which she exaggerated her foreign and domestic policy experience.
In interviews, 10 Shiites from four neighborhoods in eastern and western Baghdad described a pattern in which militia members, looking for new sources of income, turned on Shiites.
The killings follow a pattern in which al-Shabaab militants have targeted non-locals working in the predominantly Muslim region near the Kenyan-Somalia border.
