In python there's function replace(old, new) which replaces "old" to "new" in some string, is there any function like this or any way to do it in Crystal?
From the Crystal-lang api docs you can use the .sub function:
"hello yellow".sub("ll", "dd") # => "heddo yellow"
Source:
https://crystal-lang.org/api/0.23.1/String.html
NOTE: This function only replaces the first occurrence of the search string. There also appears to be a version of the sub function that allows you to pass a regex string which should allow you to grab all occurrences of a particular string.
Related
I am capturing the session id from the string. I want to add word(prefix) before the extracted session id.
Sample input: key=this is sample input; MySessionId=hhjsfd436763jhjhfdjs87787.hghht77f54; key7=jhu8787; type=raw; oldkey=jkjf8787;
I have formed the below regex to capture the MySessionId.
MySessionId=([^.]*)
I want to add a word before the extracted string like below.
Expected output:
ABCD-1234-hhjsfd436763jhjhfdjs87787
Any way to achieve this through Regular expression?
It really depends what language you're using, you'll need to find a function that replaces text in a string (usually it's called replace). It looks like you're dealing with cookies so I'll show you an example in javascript:
//$1 refers to the first group captured by the regex
//i think other languages use $1 too but you should probably check
string = string.replace(/MySessionId([^.]*)/, "ABCD-1234-$1")
I have an angular app where a user can add a regexp in a form, a value like:
github\.com/([A-Za-z0-9\-\_]+)/([A-Za-z0-9\-\_]+)
When I store this in the localStorage and I inspect the localStorage:
github\\\\.com\\/([A-Za-z0-9\\\\-\\\\_]+)\\/([A-Za-z0-9\\\\-\\\\_]+)
When I retrieve in Javascript elsewhere this value I get:
github\\.com\/([A-Za-z0-9\\-\\_]+)\/([A-Za-z0-9\\-\\_]+)
This is not the original regexp and the match method in Javascript can't work.
NOTE: after submitting the form, I store the object with:
localStorage.myobject = JSON.stringify(myobject);
You can get rid of overescaping here, just use
github[.]com/([A-Za-z0-9_-]+)/([A-Za-z0-9_-]+)
and initialize it via a RegExp constructor so as not to have to escape the regex delimiter /. A dot inside [] loses its special meaning and only matches a literal dot, the hyphen at the end of the character class only matches a literal hyphen, and the _ does not have to be escaped at all anywhere in the pattern:
var tst = "github.com/Test1-Text/Test2";
var pattern = "github[.]com/([A-Za-z0-9_-]+)/([A-Za-z0-9_-]+)";
console.log(new RegExp(pattern).test(tst));
UPDATE:
When using patterns from external sources, you need to use the constructor notation. Make sure your regex patterns are stored as literal strings (if you had RegExp("C:\\\\Folder"), make sure it is stored as C:\\Folder), and when reading the value in it will be automatically be usable with the RegExp constructor.
Trying to implement a regex script that gets the name of each function and returns them to a text file. The returning to text file part I got, the part I need some pointers in I don't.
# I just want to extract "name_i_want"
def name_i_want(self):
A regex for this could be:
(?<=def )(\w+)(?=\()
Working regex example:
http://regex101.com/r/qR3fE7
Can someone assist in creating a Regex for the following situation:
I have about 2000 records for which I need to do a search/repleace where I need to make a replacement for a known item in each record that looks like this:
<li>View Product Information</li>
The FILEPATH and FILE are variable, but the surrounding HTML is always the same. Can someone assist with what kind of Regex I would substitute for the "FILEPATH/FILE" part of the search?
you may match the constant part and use grouping to put it back
(<li>View Product Information</li>)
then you should replace the string with $1your_replacement$2, where $1 is the first matching group and $2 the second (if using python for instance you should call Match.group(1) and Match.group(2))
You would have to escape \ chars if you're using Java instead.
I made an article spinner that used regex to find words in this syntax:
{word1|word2}
And then split them up at the "|", but I need a way to make it support tier 2 brackets, such as:
{{word1|word2}|{word3|word4}}
What my code does when presented with such a line, is take "{{word1|word2}" and "{word3|word4}", and this is not as intended.
What I want is when presented with such a line, my code breaks it up as "{word1|word2}|{word3|word4}", so that I can use this with the original function and break it into the actual words.
I am using c#.
Here is the pseudo code of how it might look like:
Check string for regex match to "{{word1|word2}|{word3|word4}}" pattern
If found, store each one as "{word1|word2}|{word3|word4}" in MatchCollection (mc1)
Split the word at the "|" but not the one inside the brackets, and select a random one (aka, "{word1|word2}" or "{word3|word4}")
Store the new results aka "{word1|word2}" and "{word3|word4}" in a new MatchCollection (mc2)
Now search the string again, this time looking for "{word1|word2}" only and ignore the double "{{" "}}"
Store these in mc2.
I can not split these up normally
Here is the regex I use to search for "{word1|word2}":
Regex regexObj = new Regex(#"\{.*?\}", RegexOptions.Singleline);
MatchCollection m = regexObj.Matches(originalText); //How I store them
Hopefully someone can help, thanks!
Edit: I solved this using a recursive method. I was building an article spinner btw.
That is not parsable using a regular expression, instead you have to use a recursive descent parser. Map it to JSON by replacing:
{ with [
| with ,
wordX with "wordX" (regex \w+)
Then your input
{{word1|word2}|{word3|word4}}
becomes valid JSON
[["word1","word2"],["word3","word4"]]
and will map directly to PHP arrays when you call json_decode.
In C#, the same should be possible with JavaScriptSerializer.
I'm really not completely sure WHAT you're asking for, but I'll give it a go:
If you want to get {word1|word2}|{word3|word4} out of any occurrence of {{word1|word2}|{word3|word4}} but not {word1|word2} or {word3|word4}, then use this:
#"\{(\{[^}]*\}\|\{[^}]*\})\}"
...which will match {{word1|word2}|{word3|word4}}, but with {word1|word2}|{word3|word4} in the first matching group.
I'm not sure if this will be helpful or even if it's along the right track, but I'll try to check back every once in a while for more questions or clarifications.
s = "{Spinning|Re-writing|Rotating|Content spinning|Rewriting|SEO Content Machine} is {fun|enjoyable|entertaining|exciting|enjoyment}! try it {for yourself|on your own|yourself|by yourself|for you} and {see how|observe how|observe} it {works|functions|operates|performs|is effective}."
print spin(s)
If you want to use the [square|brackets|syntax] use this line in the process function:
'/[(((?>[^[]]+)|(?R))*)]/x',