PCRE 正则表达式必须在模式中间包含一个符号

Question

Trying to match a pattern where a symbol MUST occur in the middle of the pattern.

https://regex101.com/r/Z8CIFD/1

("fi[\w\W]{15,55}me")

The regex should look for and capture "file.name" but the pattern MUST contain " or + in the middle of the match. Example: should match the last two, but not the first.

"file.name"
"fi"+"le.na"+"me"
"f"+"il"+"e.n"+"a"+"me"

Worked on this a while and can't get it. Any help is appreciated.

Answer 1

Use a positive lookahead that matches .+[+"]. , which matches + or " somewhere in the middle of the text.

(?=.+[+"].)"f["+]*i["+]*l["+]*e["+]*\.["+]*n["+]*a["+]*m["+]?e"

The main pattern after the lookahead matches "file.name" with any number of " and + between each character.

DEMO