在 Python 中,设置 DOTALL 标志将捕获所有内容,包括换行符。
如果指定了 DOTALL 标志,则匹配任何字符,包括换行符。 docs.python.org
#example.py using Python 3.7.4
import re
str="""Everything is awesome! <pre>Hello,
World!
</pre>
"""
# Normally (.*) will not capture newlines, but here re.DOTATLL is set
pattern = re.compile(r"<pre>(.*)</pre>",re.DOTALL)
matches = pattern.search(str)
print(matches.group(1))
python example.py
Hello,
World!
捕获文档中所有开始和结束标记之间的文本
要捕获文档中所有开始和结束标记之间的文本,finditer 很有用。在下面的示例中,字符串中存在三个开始和结束<pre> 标签。
#example2.py using Python 3.7.4
import re
# str contains three <pre>...</pre> tags
str = """In two different ex-
periments, the authors had subjects chat and solve the <pre>Desert Survival Problem</pre> with a
humorous or non-humorous computer. In both experiments the computer made pre-
programmed comments, but in study 1 subjects were led to believe they were interact-
ing with another person. In the <pre>humor conditions</pre> subjects received a number of funny
comments, for instance: “The mirror is probably too small to be used as a signaling
device to alert rescue teams to your location. Rank it lower. (On the other hand, it
offers <pre>endless opportunity for self-reflection</pre>)”."""
# Normally (.*) will not capture newlines, but here re.DOTATLL is set
# The question mark in (.*?) indicates non greedy matching.
pattern = re.compile(r"<pre>(.*?)</pre>",re.DOTALL)
matches = pattern.finditer(str)
for i,match in enumerate(matches):
print(f"tag {i}: ",match.group(1))
python example2.py
tag 0: Desert Survival Problem
tag 1: humor conditions
tag 2: endless opportunity for self-reflection