正則表達式找到特定單詞后的所有單詞？

Question

我有一個如下字符串：

Features:  -Includes hanging accessories.  -Artist: William-Adolphe Bouguereau.  -Made with 100pct cotton canvas.  -100pct Anti-shrink pine wood bars and Epson anti-fade ultra chrome inks.  -100pct Hand-made and inspected in the U.S.A.  -Orientation: Horizontal.  **Subject: -Figures/Nautical and beach.**  Gender: -Unisex/Both.  Size: -Mini 17'' and under/Small 18''-24''/Medium 25''-32''/Large 33''-40''/Oversized 41'' and above.  Style: -Fine art.  Color: -Blue.  Country of Manufacture: -United States.  Product Type: -Print of painting.  Region: -Europe.  Primary Art Material: -Canvas. Dimensions:  -8'' H x 12'' W x 0.75'' D: 0.72 lb.  -12'' H x 18'' W x 0.75'' D: 1.14 lbs.  -12'' H x 18'' W x 1.5'' D: 2.45 lbs.  -18'' H x 26'' W x 0.75'' D: 1.44 lbs.  Paintings Prints Tori White Wildon Photography Photos Posters Abstract Black D cor Designs Framed Hazelwood Hokku Home Landscape Oil Accent 075 12 15 18 26 40 60 8 D H W x 1 1017 1824 2532 holidays, christmas gift gifts for girls boys

我必須找到特定單詞之后的單詞。

我想提取上面例子中"Subject"一詞之后的單詞。

輸出應如下所示：

Subject: -Figures/Nautical and beach.

我試過下面的正則表達式：

re.compile('(?<=subject)(.{30}(?:\s|.))',re.I)

但是，在指定主題關鍵字之后沒有固定數量的單詞，因此我無法指定單詞的確切數量。

如何停在“peroid”或space.There沒有特定的停止標准。

Answer 1

你的(?<=subject)(.{30}(?:\\s|.))正則表達式斷言subject之后的位置。 然后抓取除了換行符號以外的30個字符，然后匹配空格或任何字符，但匹配換行符號。 這不符合您的要求，因為子串可以是任何長度。

您可以將基於交替的正則表達式與捕獲組一起使用：

subject:\s*([^.]+|\S+)

請參閱正則表達式演示

細節 ：

• subject: - 文字subject:字符串
• \\s* - 0+空格
• ([^.]+|\\S+) - 第1組捕獲1個或多個非周期符號或1個非空白符號

注意 ：備選的順序在這里很重要 ，因為[^.]+匹配空格，而\\S+則不匹配。 如果\\s*之后的子字符串以點開頭，則\\S+將匹配該子字符串直到空格。

Python演示 ：

import re
p = re.compile(r'subject:\s*([^.]+|\S+)', re.IGNORECASE)
s = "Features:  -Includes hanging accessories.  -Artist: William-Adolphe Bouguereau.  -Made with 100pct cotton canvas.  -100pct Anti-shrink pine wood bars and Epson anti-fade ultra chrome inks.  -100pct Hand-made and inspected in the U.S.A.  -Orientation: Horizontal.  **Subject: -Figures/Nautical and beach.**  Gender: -Unisex/Both.  Size: -Mini 17'' and under/Small 18''-24''/Medium 25''-32''/Large 33''-40''/Oversized 41'' and above.  Style: -Fine art.  Color: -Blue.  Country of Manufacture: -United States.  Product Type: -Print of painting.  Region: -Europe.  Primary Art Material: -Canvas. Dimensions:  -8'' H x 12'' W x 0.75'' D: 0.72 lb.  -12'' H x 18'' W x 0.75'' D: 1.14 lbs.  -12'' H x 18'' W x 1.5'' D: 2.45 lbs.  -18'' H x 26'' W x 0.75'' D: 1.44 lbs.  Paintings Prints Tori White Wildon Photography Photos Posters Abstract Black D cor Designs Framed Hazelwood Hokku Home Landscape Oil Accent 075 12 15 18 26 40 60 8 D H W x 1 1017 1824 2532 holidays, christmas gift gifts for girls boys"
m = p.search(s)
if m:
    print(m.group())    # this includes Subject: 
    print(m.group(1))   # this does not include Subject: 

Answer 2

嘗試：

re.compile('Subject: [^*]+')

演示

Answer 3

正則表達式：

(Subject:.+)\*\*

Match Subject and content after that till '**'

碼：

str = 'Features:  -Includes hanging accessories.  -Artist: William-Adolphe Bouguereau.  -Made with 100pct cotton canvas.  -100pct Anti-shrink pine wood bars and Epson anti-fade ultra chrome inks.  -100pct Hand-made and inspected in the U.S.A.  -Orientation: Horizontal.  **Subject: -Figures/Nautical and beach.**  Gender: -Unisex/Both.  Size: -Mini 17'' and under/Small 18''-24''/Medium 25''-32''/Large 33''-40''/Oversized 41'' and above.  Style: -Fine art.  Color: -Blue.  Country of Manufacture: -United States.  Product Type: -Print of painting.  Region: -Europe.  Primary Art Material: -Canvas. Dimensions:  -8'' H x 12'' W x 0.75'' D: 0.72 lb.  -12'' H x 18'' W x 0.75'' D: 1.14 lbs.  -12'' H x 18'' W x 1.5'' D: 2.45 lbs.  -18'' H x 26'' W x 0.75'' D: 1.44 lbs.  Paintings Prints Tori White Wildon Photography Photos Posters Abstract Black D cor Designs Framed Hazelwood Hokku Home Landscape Oil Accent 075 12 15 18 26 40 60 8 D H W x 1 1017 1824 2532 holidays, christmas gift gifts for girls boys'
import re

a = re.search(r'(Subject:.+)\*\*',str)
print(a.group(1))