I am trying to create a regex that does not match a word (a-z only) if the word has a : on the end but otherwise matches it. However, this word is in the middle of a larger regex and so I (don't think) you can use a negative lookbehind and the $ metacharacter.
我正在尝试创建一个不匹配一个单词(仅a-z)的regex，如果这个单词的末尾有一个:，但在其他方面与它匹配。但是，这个词在一个较大的regex中，所以我(不认为)您可以使用一个负面的lookbehind和$ metacharacter。
I tried this negative lookahead instead:
我尝试了这种消极的展望:
([a-z]+)(?!:)
but this test case
但是这个测试用例
example:
just matches to
只是比赛
exampl
instead of failing.
而不是失败。
4 个解决方案
#1
4
If you are using a negative lookahead, you could put it at the beginning:
如果你使用的是负面展望，你可以把它放在开头:
(?![a-z]*:)[a-z]+
i.e: "match at least one a-z char, except if the following chars are 0 to n 'a-z' followed by a ':'"
我。e:“匹配至少一个a-z字符，除非下面的字符是0到n 'a-z'，然后是':'”。
That would support a larger regex:
这将支持更大的regex:
X(?![a-z]*:)[a-z]+Y
would match in the following string:
将匹配为以下字符串:
Xeee Xrrr:Y XzzzY XfffZ
only 'XyyyY'
只有“XyyyY”
#2
0
Try this:
试试这个:
[a-z]\s
#3
0
([a-z]+\b)(?!:)
asserts a word boundary at the end of the match and thus will fail "exampl"
在匹配结束时断言单词边界，因此将失败“exampl”
#4
0
[a-z]+(?![:a-z])
[a - z]+(? ![a - z]):
#1
4
If you are using a negative lookahead, you could put it at the beginning:
如果你使用的是负面展望，你可以把它放在开头:
(?![a-z]*:)[a-z]+
i.e: "match at least one a-z char, except if the following chars are 0 to n 'a-z' followed by a ':'"
我。e:“匹配至少一个a-z字符，除非下面的字符是0到n 'a-z'，然后是':'”。
That would support a larger regex:
这将支持更大的regex:
X(?![a-z]*:)[a-z]+Y
would match in the following string:
将匹配为以下字符串:
Xeee Xrrr:Y XzzzY XfffZ
only 'XyyyY'
只有“XyyyY”
#2
0
Try this:
试试这个:
[a-z]\s
#3
0
([a-z]+\b)(?!:)
asserts a word boundary at the end of the match and thus will fail "exampl"
在匹配结束时断言单词边界，因此将失败“exampl”
#4
0
[a-z]+(?![:a-z])
[a - z]+(? ![a - z]):