とみるや (to-miru-ya): As soon as one sees
～とみるや (to-miru-ya)
Meaning
As soon as one sees
Formation and usage
plain clause + と見るや（否や）
Notation: N = noun; V dictionary = dictionary-form verb; V stem = the stem before ます; plain clause = plain-form clause; negative stem = the form before ない. Follow the attachment shown above.
Explanation
Describes an immediate response to an observed situation, often in a narrative about someone else.
Examples
会議が終わったと見るや、彼は先生に駆け寄った。
As soon as he saw that the meeting had ended, he ran over to the teacher.
試験が終わったと見るや、彼は先生に駆け寄った。
As soon as he saw that the exam had ended, he ran over to the teacher.
研修が終わったと見るや、彼は先生に駆け寄った。
As soon as he saw that the training session had ended, he ran over to the teacher.
発表会が終わったと見るや、彼は先生に駆け寄った。
As soon as he saw that the presentation event had ended, he ran over to the teacher.
面接が終わったと見るや、彼は先生に駆け寄った。
As soon as he saw that the interview had ended, he ran over to the teacher.
How related patterns differ
が早いか, なり, and や否や narrate an immediate following event. か～ないかのうちに suggests the first may not yet have finished. そばから often describes an action being repeated or undone, rather than simply a sequence.