A task that appears regularly in my workflow is text parsing. It may be about getting a token from a single line of text or about turning the text output of native tools into structured objects so I can leverage the power of PowerShell. I always strive to create structure as early as I can in the pipeline, so that later on I can reason about the content as properties on objects instead of as text at some offset in a string.

This also helps with sorting, since the properties can have their correct type, so that numbers, dates etc. This is not a text about how to create a high performance parser for a language with a structured EBNF grammar. This is a minor subset of the available functions. It may be well worth your time to read up on the string class since it is so fundamental in PowerShell. Docs are found here. As an example, this can be useful when we have very large input data of comma-separated input with 15 columns and we are only interested in the third column from the end.

If we were to use the -split ',' operator, we would create 15 new strings and an array for each line. On the other hand, using LastIndexOf on the input string a few times and then SubString to get the value of interest is faster and results in just one new string.

From experience, I also know that it is easy to mess up the index arithmetics. So while using these methods can improve performance, it is also more error prone and a lot more to type. I would only resort to this when I know the input data is very large and performance is an issue. So this is not a recommendation, or a starting point, but something to resort to. On rare occasions, I write the whole parser in C.

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An example of this is in a module wrapping the Perforce version control system, where the command line tool can output python dictionaries. It is a binary format, and the use case was complicated enough that I was more comfortable with a compiler checked implementation language. Almost all of the parsing options in PowerShell make use of regular expressions, so I will start with a short intro of some regular expression concepts that are used later in these posts.

Regular expressions are very useful to know when writing simple parsers since they allow us to express patterns of interest and to capture text that matches those patterns. It is a very rich language, but you can get quite a long way by learning a few key parts. It is not written directly for the. The above pattern can be written like this using the x ignore pattern whitespace modifier. Starting the regex with?Reports the zero-based index of the first occurrence of a specified Unicode character or string within this instance.

The method returns -1 if the character or string is not found in this instance.

-- string '192' is not found within $b and $b shows all values from the file.

Reports the zero-based index of the first occurrence of the specified string in this instance. The search starts at a specified character position and examines a specified number of character positions.

Reports the zero-based index of the first occurrence of the specified string in the current String object. Parameters specify the starting search position in the current string, the number of characters in the current string to search, and the type of search to use for the specified string.

Parameters specify the starting search position in the current string and the type of search to use for the specified string.

Reports the zero-based index of the first occurrence of the specified character in this instance. A parameter specifies the type of search to use for the specified string. Reports the zero-based index of the first occurrence of the specified Unicode character in this string. A parameter specifies the type of search to use for the specified character. The search starts at a specified character position. The zero-based index position of value from the start of the current instance if that string is found, or -1 if it is not.

If value is Emptythe return value is startIndex. The following example finds the index of all occurrences of the string "he" within a substring of another string. Note that the number of characters to be searched must be recalculated for each search iteration. Index numbering starts from 0 zero.

The startIndex parameter can range from 0 to the length of the string instance. This method performs a word case-sensitive and culture-sensitive search using the current culture.

Character sets include ignorable characters, which are characters that are not considered when performing a linguistic or culture-sensitive comparison.

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In a culture-sensitive search, if value contains an ignorable character, the result is equivalent to searching with that character removed.

If value consists only of one or more ignorable characters, the IndexOf String, Int32, Int32 method always returns startIndexwhich is the character position at which the search begins.Searches for the specified object and returns the index of its first occurrence in a one-dimensional array or in a range of elements in the array. Searches for the specified object and returns the index of its first occurrence in a one-dimensional array.

powershell indexof

Searches for the specified object in a range of elements of a one-dimensional array, and returns the index of its first occurrence. The range extends from a specified index to the end of the array. Searches for the specified object in a range of elements of a one-dimensional array, and returns the index of ifs first occurrence.

The range extends from a specified index for a specified number of elements. Searches for the specified object in a range of elements of a one dimensional array, and returns the index of its first occurrence. The index of the first occurrence of value in arrayif found; otherwise, the lower bound of the array minus 1. The example calls the following three overloads of the IndexOf method to find the index of a string in a string array:. IndexOf Array, Objectto determine the first occurrence of the string "the" in a string array.

IndexOf Array, Object, Int32to determine the first occurrence of the string "the" in the fourth to the last elements of a string array. IndexOf Array, Object, Int32, Int32to determine the first occurrence of the string "the" in a string array from the element that follows the last successful match to the end of the array.

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This method searches all the elements of a one-dimensional array for value. To determine whether value exists in arraythe method performs an equality comparison by calling each element's Equals method until it finds a match.

This means that if the element overrides the Object. Equals Object method, that override is called. Because most arrays have a lower bound of zero, this method generally returns -1 if value isn't found. In the rare case that the lower bound of the array is equal to Int MinValue 0x and value isn't found, this method returns Int This method is an O n operation, where n is the Length of array. The index of the first occurrence of valueif it's found, within the range of elements in array that extends from startIndex to the last element; otherwise, the lower bound of the array minus 1.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Yes, you can. The IndexOf method has an overload that takes a startIndex argument:. In the second example, we look for the index of the substring "Words" starting after character index 2. Note on the answer from Mathias R. Jessen :. The String.

powershell indexof

IndexOf method is in fact a. NET method of the string object. This appears from the fact that it is case-sensitive by default which is not common for PowerShell :. But you might also consider the Select-String cmdlet which gives you more possibilities including regular expressions :.

Windows PowerShell Intermediate Chapter 05 - Regular Expressions

Learn more. How do I find the position of substring in PowerShell after position x? Ask Question. Asked 5 years, 2 months ago. Active 1 year, 3 months ago. Viewed 59k times.

Parsing Text with PowerShell (1/3)

Is there a simple way to do so; I can't find any. Am I obliged to scan character by character? I don't want a string as return, but a position so do not suggest SubString.

Peter Mortensen Depending on what you're looking to find in the string, it could be easier to use a Regular Expression. Can you post the string you need to scan and the substring you're looking for so we can provide a better answer?By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

Get-Content returns an array of strings, and arrays have their own. IndexOf method which looks for items in the array.

Learn more. Asked 2 years, 6 months ago. Active 2 years, 6 months ago. Viewed 2k times. You save it as single line or as multiple lines? Active Oldest Votes. Or something like select-string to test any line in the file.

TessellatingHeckler TessellatingHeckler Than you TessellatingHeckler, -raw option has worked exactly as I wanted. Sign up or log in Sign up using Google.

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Find the Index Number of a Value in a PowerShell Array

I've got a problem searching an INDEX in an array made up by query sessions command in a terminal server. Now imagine logging in the terminal server using the account name TEST instead of test.

I think that's because of the case sensitivity, isn't it? Is there any simple way to solve this problem and make the search of the index case-insensitive? That being said, an array in Powershell can be indexed case-insensitively if it is converted to a [Collections. List[Object]] type. Note that pulling every single user object in AD and filtering using where-object or index matching can be very slow.

If you insist on having all ADUsers in one spot with one pull, consider looping over the list once to make a hash lookup so you can easily index the hash value. Learn more. Is it possible to make IndexOf case-insensitive in PowerShell?

powershell indexof

Ask Question. Asked 1 year, 11 months ago. Active 3 months ago. Viewed times. TelephoneNumber then I don't get the telephone number. Paolo Paolo 53 1 1 silver badge 8 8 bronze badges. You might also be interested in stackoverflow. Active Oldest Votes. Bil1 Bil1 1 1 silver badge 17 17 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.

powershell indexof

The Overflow Blog. Podcast Ben answers his first question on Stack Overflow.Reports the index of the first occurrence in this instance of any character in a specified array of Unicode characters. The method returns -1 if the characters in the array are not found in this instance. Reports the zero-based index of the first occurrence in this instance of any character in a specified array of Unicode characters.

The search starts at a specified character position. The search starts at a specified character position and examines a specified number of character positions. The zero-based index position of the first occurrence in this instance where any character in anyOf was found; -1 if no character in anyOf was found. The search for anyOf is case-sensitive.

If anyOf is an empty array, the method finds a match at the beginning of the string that is, at index zero. This method performs an ordinal culture-insensitive search, where a character is considered equivalent to another character only if their Unicode scalar values are the same.

To perform a culture-sensitive search, use the CompareInfo. The following example finds the index of the occurrence of any character of the string "is" within a substring of another string. Index numbering starts from zero. The startIndex parameter can range from 0 to one less than the length of the string instance. This method performs an ordinal culture-insensitive search, where a character is considered equivalent to another character only if their Unicode scalar value are the same.

The following example finds the index of the occurrence of any character of the string "aid" within a substring of another string. Skip to main content. Contents Exit focus mode.

IndexOfAny Char[]. IndexOfAny Char[], Int Is this page helpful? Yes No. Any additional feedback? Skip Submit.