如何用grep限定符提取目标词汇？优化命令获纯单词结果

Here are a couple of practical solutions to pull just the clean words from your Markdown file, stripping out the ** markers and any accompanying释义 content:

Solution 1: Using Perl-Compatible Grep (grep -P) #

If your system supports grep -P (most modern Linux/macOS setups do), this single command will directly extract the words you need:

grep -oP '\*\*\K[A-Za-z]+(?=\*\*|[: ])' Principles_20_LifePrinciples.md | grep -v -e "Origin" -e "Etymology"

Breakdown: #

• \*\*\K: Skips the opening ** without including it in the output.
• [A-Za-z]+: Matches one or more alphabetic characters (your target words).
• (?=\*\*|[: ]): A positive lookahead that stops matching when it hits closing ** or a colon/space (assuming释义 starts here).
• The final grep -v filters out unwanted entries like "Origin" and "Etymology".

Solution 2: Using Grep + Sed (Portable Across Systems) #

If grep -P isn't available, this pipeline works with standard grep and sed on almost any system:

grep -o '\*\*[^*]*\*\*' Principles_20_LifePrinciples.md | grep -v -e "Origin" -e "Etymology" | sed -E 's/\*\*([A-Za-z]+).*\*\*/\1/'

Breakdown: #

• The initial grep extracts all text wrapped in **.
• The second grep removes lines containing "Origin" or "Etymology".
• sed -E captures the first sequence of letters inside the ** and replaces the entire line with just that word, discarding any释义 content.

Both commands will give you a clean list of pure words like circumstance, case, condition, Anxiety, anxiety.

内容的提问来源于stack exchange，提问作者user9062604