escaping

问题 I would like to call the following bash command in MATLAB: grep "Up to" ~/test_linux/vision1.1/log | awk '{print $7}' I use system() in MATLAB, but it turns out to have errors: >> [status string]=system('grep "Up to" ~/test_linux/vision1.1/log | awk '{print $7}' '); ??? [status string]=system('grep "Up to" ~/test_linux/vision1.1/log | awk '{print $7}' '); Error: Unbalanced or unexpected parenthesis or bracket. Do I need to escape some special characters in the bash command as a string in

问题 What is the name and function of the \c escape character in Bash? What is its numeric value? I have seen that \cx is a control character, but what about plain \c ? It seems that: echo -e "Hello World\c" and echo -en "Hello World" are equivalent. However, Python doesn't use it as an escape character, and it is missing from all of the lists of escape characters I found. Is this a Bash-specific behavior? 回答1: That's actually specific to some versions of echo (I'm pretty sure that \c came from

问题 Is there a simple way to escape/unescape an arbitrary character in PHP by doubling it, for example: in ANSI SQL, "you can ""escape"" this way" in printf(), you can express a %% this way Escaping is quite easy with str_replace() , but reversing the process to unescape the string is not that easy, so does anyone know of a pair of functions, or a library to do this? The idea is that I need to serialize an array this way: array('a','b', '~','c') => 'a~b~~~~c' The individual strings cannot be

问题 This question already has answers here : How do I deal with a filename that starts with the hyphen (-) character? (4 answers) Closed 4 years ago . I have accidentally created a file in GitBash (a Unix like environment) with the name - -l (I have absolutely no idea how I managed to do this in the first place :) Johnny (master #) scipy-tentative-numpy-tutorials $ ls -l total 1 -rw-r--r-- 1 Johnny Administ 956 May 7 16:24 - -l -rw-r--r-- 1 Johnny Administ 562 May 7 16:21 README.md I wish to

问题 I'm using mysqli. When I echo mysqli_real_escape_string($db,mysqli_real_escape_string($db,'"')); which one of those will be the output: 1. \" 2. \\\" ? Is there a safe way to check whether a string has been already escaped? Unfortunately, I cannot test at present as I cannot access MySQL for 24 hours. 回答1: The output is \\\" (your second example). I don't think you can reliably say whether a string has already been escaped or not, you should organize your code in a way that you only can call

问题 Here I've found a grate way to HTML encode/escape special chars. Now I wonder how to unescape HTML encoded text in C++? So codebase is: #include <algorithm> namespace xml { // Helper for null-terminated ASCII strings (no end of string iterator). template<typename InIter, typename OutIter> OutIter copy_asciiz ( InIter begin, OutIter out ) { while ( *begin != '\0' ) { *out++ = *begin++; } return (out); } // XML escaping in it's general form. Note that 'out' is expected // to an "infinite"

问题 Any ideas of how the following problem can be solved would be highly appreciated. INPUT: <p> <div> Original<br/>This is the original <b>acid</b>, a hydroxy monocarboxylic <span class="hl1">acid</span>. </div> </p> Desired Output: <p> <div> Original<br/>This is the original <b>acid</b>, a hydroxy monocarboxylic <span class="hl1">acid</span>. </div> </p> Attempt 1: `<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > <xsl:output omit-xml-declaration="yes" indent="no

问题 I have a frustrating problem that I'm unable to solve. I am using Newtonsoft.Json to deserialize some .json data. I can plainly see in the raw json string that there are character sequences { '\\', 'u', '0', '0', '1', 'd' } This represents "group separator" (ascii 29 or 0x1D). However, when I deserialize using JsonConvert.DeserializeObject<> these character sequences are not put correctly into their objects. What is put in instead is simply 1D. That is if you look at the character array you

问题 I have a ASP.Net web handler that returns results of a query in JSON format public static String dt2JSON(DataTable dt) { String s = "{\"rows\":["; if (dt.Rows.Count > 0) { foreach (DataRow dr in dt.Rows) { s += "{"; for (int i = 0; i < dr.Table.Columns.Count; i++) { s += "\"" + dr.Table.Columns[i].ToString() + "\":\"" + dr[i].ToString() + "\","; } s = s.Remove(s.Length - 1, 1); s += "},"; } s = s.Remove(s.Length - 1, 1); } s += "]}"; return s; } The problem is that sometimes the data returned

问题 I know there are a lot of JavaScript escaping questions, but nothing seemed to fit my needs. I have textarea elements being dynamically displayed on a JSP. In the case of invalid form submits, I need to repopulate these fields with the values the user entered. I am doing this like so (note: simplified version): var textareaBox = document.getElementById("myTextArea"); if (textareaBox) { textareaBox.value = '${myForm.myValue}'; } Everything works fine until the user enters a value in the box