A maniac slashed the editor of real estate blog Brownstoner from cheek to lip on a Brooklyn subway train — and she told The Post she feared she would die before she could get help.

Cate Corcoran, 51, was on a Manhattan-bound A train at the Nostrand Avenue station at 5:45 p.m. Wednesday when the creep snatched her iPhone and he sliced her down the left side of her face with a sharp object, police said.

He fled the station with the phone, officials said.

“I just worried that I was going to bleed to death — fortunately, that didn’t happen,” Corcoran told The Post.

Fellow straphangers helped Cocoran get to a station agent’s booth to call 911, she said. She was taken to Kings County Hospital, received about 40 stitches, and was released later that evening, she said.

Corcoran sees herself as part of a growing statistic.

“I have heard about a lot of the subway slashings over the year,” she said.

Violence in the transit system is indeed on the rise.

There were 60 felony assaults reported on buses and subways in January and February this year — compared to 56 over the same period last year, according to the most recent MTA figures available. There were just 36 for the same period in 2015, and only 29 the year before that.

Subway slashings are also on the rise.

A spike in transit knife-play last year was so stark that it prompted the Guardian Angels to begin patrolling the subways for the first time in more than two decades — but 2017 is already proving a more bloody year.

As of April 9, there had been 30 transit slashings this year — there were only 25 in the same period last year, police data shows.

Robberies in the transit system have declined, however, from 140 for the period in 2016 to 100 this year, according to police figures.

Corcoran moved from San Francisco to New York just weeks after the 9/11 terror attacks and never let the prospect of crime or terror deter her from her dream of living in the Big Apple, her ex-husband said.

“Cate had wanted to live here for a long time,” Mark Gimein told The Post. “People were asking, ‘Is New York gonna be a terrifying place to live?’ but Cate was completely unfazed.”

And the attack won’t stop her from taking the train.

“That would be impractical,” she said. “In the future I will be careful to ride in a car closer to the conductor and with more people in it.”

Co-workers were shocked and said Corcoran was a gentle person and a driving force at the real estate blog.

Police released footage of the suspect — who is about 6 feet tall, weighs 250 to 300 pounds, and sports a beard — with the hope that someone can identify him, an official said.

“We were able to grab some images of him going through the turnstile,” NYPD Chief Robert Boyce said at an unrelated press conference Thursday. “We ask the public’s help with that.”