正则表达式需求：匹配.scss前无-map的文件名及问题求助

Let's break down why your original regex [a-zA-Z]+(?!-map).scss isn't working, then fix it with reliable solutions.

What's Wrong With the Original Regex? #

1. Missing full-filename anchors: Without ^ (start) and $ (end) markers, your regex matches substrings inside filenames instead of the whole thing. For example, in something-map.scss, it will latch onto the map.scss portion, causing false positives.
2. Too restrictive character set: [a-zA-Z]+ only matches letters, so it can't handle hyphens in filenames like something-something.scss—it stops at the first hyphen and fails to match the full filename.

Working Solutions #

Option 1: Negative Lookahead (Most Universal)

This regex explicitly excludes filenames ending with -map.scss while ensuring they still end with .scss:

^(?!.*-map\.scss$).*\.scss$

• ^ anchors the match to the start of the filename
• (?!.*-map\.scss$) is a negative lookahead that blocks any filename ending with -map.scss
• .*\.scss$ matches any characters followed by .scss at the end of the filename

Option 2: Negative Lookbehind (For Engine-Specific Use)

If your regex tool supports fixed-length lookbehinds (like JavaScript, Python, or grep with -P), this checks directly that .scss isn't preceded by -map:

.*(?<!-map)\.scss$

• .* matches all characters leading up to the end of the filename
• (?<!-map) is a negative lookbehind that verifies the 4 characters before .scss aren't -map
• \.scss$ ensures the filename ends with .scss

Testing Against Your Examples #

• something-something.scss: Both regexes match ✅
• something-map.scss: Both regexes do not match ✅
• something.scss: Both regexes match ✅

内容的提问来源于stack exchange，提问作者user12023283