正则表达式禁止连续超过 1 个破折号 [英] Regex to disallow more than 1 dash consecutively

问题描述

1. 如何禁止 --(连续 1 个以上 -)?例如ab--c
2. - 在单词后面不允许，例如abc-
3. - 在词的开头不允许，例如-abc

1. How can I disallow -- (more than 1 consecutive -)? e.g. ab--c
2. - at the back of words not allow, e.g. abc-
3. - at start of words not allow, e.g. -abc

^[A-Za-z0-9-]+$ 是我目前所拥有的.

推荐答案

^(?!-)(?!.*--)[A-Za-z0-9-]+(?<!-)$

说明:

^             # Anchor at start of string
(?!-)         # Assert that the first character isn't a -
(?!.*--)      # Assert that there are no -- present anywhere
[A-Za-z0-9-]+ # Match one or more allowed characters
(?<!-)        # Assert that the last one isn't a -
$             # Anchor at end of string

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