如何使用正则表达式提取化学术语

Question

我需要在Python中使用正则表达式提取化学术语。例如，给定以下输入字符串，我需要提取输出：

输入字符串：

"the common composition consists of 3,4,5-trihydroxybenzaldehyde and 4-(1-imidazolyl)benzaldehyde, and mixture thereof."

输出列表：

['the', 'common', 'composition', 'consists', 'of', '3,4,5-trihydroxybenzaldehyde', '4-(1-imidazolyl)benzaldehyde', 'and', 'mixture', 'thereof']

感谢您的帮助。

Answer 1

我们可能需要一个比以下更复杂的表达式：

b[a-z0-9-,)(]+b

但是，在此特定示例中，我们所需的输出可能会在此处返回。

演示

测试

# coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility
import re
regex = r"b[a-z0-9-,)(]+b"
test_str = "the common composition consists of 3,4,5-trihydroxybenzaldehyde and 4-(1-imidazolyl)benzaldehyde, and mixture thereof."
matches = re.finditer(regex, test_str, re.MULTILINE | re.IGNORECASE)
for matchNum, match in enumerate(matches, start=1):
    
    print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group()))
    
    for groupNum in range(0, len(match.groups())):
        groupNum = groupNum + 1
        
        print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum)))
# Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.