trim | 易学教程

Correct way to trim a string in Java

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问题 In Java, I am doing this to trim a string: String input = " some Thing "; System.out.println("before->>"+input+"<<-"); input = input.trim(); System.out.println("after->>"+input+"<<-"); Output is: before->> some Thing <<- after->>some Thing<<- Works. But I wonder if by assigning a variable to itself, I am doing the right thing. I don't want to waste resources by creating another variable and assigning the trimmed value to it. I would like to perform the trim in-place. So am I doing this right?

How to use a TRIM function in SQL Server

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问题 I cannot get this TRIM code to work SELECT dbo.COL_V_Cost_GEMS_Detail.TNG_SYS_NR AS [EHP Code], dbo.COL_TBL_VCOURSE.TNG_NA AS [Course Title], LTRIM(RTRIM(FCT_TYP_CD)& ') AND (' & LTRIM(RTRIM(DEP_TYP_ID) & ')' AS [Course Owner] 回答1: You are missing two closing parentheses...and I am not sure an ampersand works as a string concatenation operator. Try '+' SELECT dbo.COL_V_Cost_GEMS_Detail.TNG_SYS_NR AS [EHP Code], dbo.COL_TBL_VCOURSE.TNG_NA AS [Course Title], LTRIM(RTRIM(FCT_TYP_CD)) + ') AND ('

Left Trim in Javascript

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there are lots of scripts out there to trim a string in javascript, but none how to Left Trim String. This is what I use to trim: String.prototype.trim = function() { return this.replace(/^\s+|\s+$/g,""); } But I would like to change this a little and create a new function called leftTrim that only removes the leading space. My regex is pretty limited, so any help is much appreciated. Cheers Use: String.prototype.leftTrim = function() { return this.replace(/^\s+/,""); } In the regex the: ^ means "from the beginning of the string" \s means whitespace character class + means one-or more (greedy)

Best way to verify string is empty or null

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问题 i am sure this must have been asked before in different ways - as isEmptyOrNull is so common yet people implement it differently. but i have below curious query in terms of best available approach which is good for memory and performance both. 1) Below does not account for all spaces like in case of empty XML tag return inputString==null || inputString.length()==0; 2) Below one takes care but trim can eat some performance + memory return inputString==null || inputString.trim().length()==0; 3)

Iterate through Object's own Strings & Trim each

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问题 I have multiple large objects which each have about 60 strings. I have to trim all those strings, and I'd like to do so without having to go this.mystring = this.mystring.Trim(). Instead, I'm looking for a way to automatically have each object discover its own strings and then perform the operation. I know a little bit about reflection, but not enough, but I think this is possible? Also, I'm not sure if this matters, but some string properties are read-only (only have a getter), so those

How do you trim the audio file's end using SoX?

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问题 Using Sox, how do I shorten an audio file by 5 seconds, trimming from the end? For example, this is how to trim a file from the beginning: sox input output trim 5000 This is how to add 5 seconds of silence to the end: sox input output pad 0 5000 回答1: The syntax is sox input output trim <start> <duration> e.g. sox input.wav output.wav trim 0 00:35 will output the first 35 seconds into output.wav . (you can know what the length is using sox input -n stat ) From the SoX documentation on the trim

Trim white spaces in both Object key and value recursively

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How do you trim white spaces in both the keys and values in a JavaScript Object recursively? I came across one issue in which I was trying to "clean" a user supplied JSON string and send it into my other code for further processing. Let's say we've got a user supplied JSON string whose property key and value are of type "string". However, what's problematic in this case is that the keys and values are not as clean as desired. Say a { " key_with_leading_n_trailing_spaces ": " my_value_with_leading_spaces" }. In this case, it can easily cause issue with your brilliantly written JavaScript

Sending ATA commands directly to device in Windows?

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I’m trying to send ATA commands to a physical disk in Windows, and get the response from the device. Note: In this case I want to send the IDENTIFY DEVICE (0xEC) command. The device will respond with a 512-byte block of data. (In particular I’m interested in bit 0 of word 119 - the device’s support for the TRIM command ). I know that I need to use CreateFile to open the device: handle = CreateFile( "\\.\PhysicalDrive0", GENERIC_READ, FILE_SHARE_READ, nil, // no security attributes OPEN_EXISTING, 0, // flags and attributes nil // no template file ); But after this I’m stymied about what to do.

How Do I Trim Leading and Trailing Quote from MySQL Row?

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I have a MySQL table that I have imported from a CSV file. In this process, a bunch of the entries have quote marks leading and trailing the entry of several data rows. For example the the table 'example_table' I have a row called 'title.' Some of these titles are written as: "title1" "title2" "title3" and some are written without the quote marks: title4 title5 title6 I have tried a variety of SQL calls to trim the row but I keep getting errors. Here is my sql call: SELECT * FROM `example_table` TRIM(LEADING '"' FROM "title") This is the error from MySQL when I run the call: 1064 - You have an

Trim to remove white space

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问题 jQuery trim not working. I wrote the following command to remove white space. Whats wrong in it? var str = $('input').val(); str = jquery.trim(str); console.log(str); Fiddle example. 回答1: jQuery.trim() capital Q? or $.trim() 回答2: No need for jQuery JavaScript does have a native .trim() method. var name = " John Smith "; name = name.trim(); console.log(name); // "John Smith" Example Here String.prototype.trim() The trim() method removes whitespace from both ends of a string. Whitespace in this