将 php 和 python 中的 RegEx 语法转换为 JS

Question

I have this RegEx syntax: "(?<=[az])-(?=[az])"

It captures a dash between 2 lowercase letters. In example below the second dash is captured:

Krynica-Zdrój, ul. Uzdro-jowa

Unfortunately I can't use <= in JS. My ultimate goal is to remove the hyphen with RegEx replace.

Answer 1

It seems to me you need to remove the hyphen in between lowercase letters.

Use

 var s = "Krynica-Zdrój, ul. Uzdro-jowa"; var res = s.replace(/([az])-(?=[az])/g, "$1"); console.log(res);

Note the first lookbehind is turned into a simple capturing group and the second lookahead is OK to use since - potentially, if there are chunks of hyphenated single lowercase letters - it will be able to deal with overlapping matches.

Details :

• ([az]) - Group 1 capturing a lowercase ASCII letter
• - - a hyphen
• (?=[az]) - that is followed with a lowercase ASCII letter that is not added to the result - /g - a global modifier, search for all occurrences of the pattern
• "$1" - the replacement pattern containing just the backreference to the value stored in Group 1 buffer.

VBA sample code :

Sub RemoveExtraHyphens()
Dim s As String
Dim reg As New regexp

reg.pattern = "([a-z])-(?=[a-z])"
reg.Global = True

s = "Krynica-Zdroj, ul. Uzdro-jowa"
Debug.Print reg.Replace(s, "$1")
End Sub