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➜ MUSHclient
➜ Lua
➜ Silly question, with what I'm sure has a simple answer
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Silly question, with what I'm sure has a simple answer
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| Posted by
| Rivius
(99 posts) Bio
|
| Date
| Sat 11 Jun 2011 08:22 AM (UTC) |
| Message
| I'm trying to make a function to do a search, however, I encounter some troubles when I use hyphenated words.
For example string.find("hyphenated-word", "hyphenated-word") will give no result for me. | | Top |
|
| Posted by
| Nick Gammon
Australia (23,140 posts) Bio
Forum Administrator |
| Date
| Reply #1 on Sat 11 Jun 2011 08:48 AM (UTC) |
| Message
| Hyphen is one of the regexp "magic" symbols. Try putting a % in front of it.
print (string.find("hyphenated-word", "hyphenated%-word") ) --> 1 15
|
- Nick Gammon
www.gammon.com.au, www.mushclient.com | | Top |
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| Posted by
| Rivius
(99 posts) Bio
|
| Date
| Reply #2 on Sat 11 Jun 2011 05:10 PM (UTC) |
| Message
| Hrm, well I've tried dealing with the string by doing this:
local what = string.gsub("%1", "-", "%-")
and this
local what = string.gsub("%1", "%-", "%-")
But it doesn't seem to help. | | Top |
|
| Posted by
| Nick Gammon
Australia (23,140 posts) Bio
Forum Administrator |
| Date
| Reply #3 on Sat 11 Jun 2011 10:56 PM (UTC) |
| Message
| What are you trying to do here? Replace a hyphen by a hyphen?
You need the % in the regular expression, eg.
what = string.gsub("hyphenated-word", "%-", "(hello)")
print (what) --> hyphenated(hello)word
However I should point out that if you are doing this in "send to script" that the % symbol has its own meaning (eg. %1, %2, and so on), so if using regular expressions you have to double them.
Eg (in send-to-script box):
what = string.gsub("hyphenated-word", "%%-", "(hello)")
print (what) --> hyphenated(hello)word
|
- Nick Gammon
www.gammon.com.au, www.mushclient.com | | Top |
|
| Posted by
| Rivius
(99 posts) Bio
|
| Date
| Reply #4 on Sun 12 Jun 2011 05:23 AM (UTC) |
| Message
| Ah yes. This is in a script file and is a search function to find room names in my map databased. Here's an excerpt of the code
if string.find(string.lower(map_table[a].name), string.lower(string.gsub(name, "%-", "%-")))
I was just trying to make it so that typing "cloud-formation" would still give a match. At the moment "cloud-" and "formation" do, but the other doesn't because of the regex problem I presume.
I'm sorry if I'm doing this entirely improperly :P | | Top |
|
| Posted by
| Nick Gammon
Australia (23,140 posts) Bio
Forum Administrator |
| Date
| Reply #5 on Sun 12 Jun 2011 07:07 AM (UTC) |
| Message
| If it's in a script file, then the syntax is OK but I don't know what you are trying to achieve. See this:
print ((string.gsub("hyphenated-word", "%-", "%-"))) --> hyphenated-word
You are replacing a hyphen with a hyphen. Why? |
- Nick Gammon
www.gammon.com.au, www.mushclient.com | | Top |
|
| Posted by
| Rivius
(99 posts) Bio
|
| Date
| Reply #6 on Sun 12 Jun 2011 07:32 AM (UTC) |
| Message
| | Well, I have an alias where you enter a query and it searches the map table and returns matches. I encountered a problem where it wouldn't return matches if I typed a hyphenated word. | | Top |
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| Posted by
| Rivius
(99 posts) Bio
|
| Date
| Reply #7 on Mon 13 Jun 2011 08:39 PM (UTC) |
| Message
| I've figured out the problem. Strangely enough, I had to double escape the second hyphen.
string.lower(string.gsub(name, "%-", "%%-"))
But now it works. Thanks. | | Top |
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| Posted by
| Larkin
(278 posts) Bio
|
| Date
| Reply #8 on Wed 15 Jun 2011 02:51 PM (UTC) |
| Message
| | You didn't double escape the hyphen, technically. You had to escape the percent sign in order to replace your hyphen with percent hyphen. In fact, %%%- would probably be more correct, escaping both symbols. | | Top |
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| Posted by
| Rivius
(99 posts) Bio
|
| Date
| Reply #9 on Sat 25 Jun 2011 06:54 PM (UTC) |
| Message
| | Ah. That makes sense. I didn't even think of it that way. | | Top |
|
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