Break down a string into an array/list bij alphabet and non-alphabet characters

Question

I need to breakdown a string into an array or list of character sets based on the set beeing alphabet characters and non-alphabet characters.

For example:

string = -"Hello12$th'ere!@4"

the required result = [-"][Hello][12$][th]['][ere][!@4]

Does anyone have an idea of how to get to the required result? I was trying to achieve this by searching for a regex.split solution, but I can't find an expression that suits my needs.

EvilTak · Accepted Answer · 2016-03-07T11:55:57.263

2

This simple regex does the trick: ([a-zA-Z]+|[^a-zA-Z]+)

Test it out here.

edited Mar 07 '16 at 11:55

answered Mar 07 '16 at 11:45

EvilTak

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Thanx a lot!! Works like a charm :-) – Dennis Betten Mar 07 '16 at 11:46
1

Are you sure? Check [`-"Hello12$th'ere!^@4"`](https://regex101.com/r/uA3aF3/1). Check [*Why is this regex allowing a caret?*](http://stackoverflow.com/questions/29771901/why-is-this-regex-allowing-a-caret/29771926#29771926) and please fix your pattern. – Wiktor Stribiżew Mar 07 '16 at 11:47
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It should be [a-zA-Z] og [a-z] and ignore case. – Casperah Mar 07 '16 at 11:53
Will this work when the string ends in a run of letters? – Sergey Kalinichenko Mar 07 '16 at 11:56
1

@WiktorStribiżew Thank you for pointing that out. I missed the capital Z, wasn't paying attention :) – EvilTak Mar 07 '16 at 11:57

score 0 · Answer 2 · answered Mar 07 '16 at 12:01

0

You could use Regex.Split with a pattern that looks for a border between a letter and a non-letter usung look-ariund expressions:

var t=Regex.Split(s, @"(?<=[a-zA-Z])(?=[^a-zA-Z])|(?<=[^a-zA-Z])(?=[a-zA-Z])");

Demo.

answered Mar 07 '16 at 12:01

Sergey Kalinichenko

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Break down a string into an array/list bij alphabet and non-alphabet characters

2 Answers2