string-comparison

问题 I know it's commonly accepted that using strcmp is the proper way to compare strings, but my question is why? According to the help: A == B does element by element comparisons between A and B and returns a matrix of the same size with elements set to logical 1 where the relation is true and elements set to logical 0 where it is not. And all the toy examples I can come up with seem to work out. 回答1: strcmp also checks that the inputs are class char, e.g., strcmp('a',double('a')) returns false,

问题 I'm actually trying to answer this question but as that's very involved and unlikely to get a good response quickly, I'm going to try and work out the implementation myself. The fundamental problem seems to be that the C# example I was following doesn't translate directly to VB. When examining a String comparison BinaryExpression in a lambda, VB reports the Expression.Method.DeclaringType to be Microsoft.VisualBasic.CompilerServices.Operators with a method name of CompareString . This is

问题 I'm trying to find a PowerShell solution to remove lines from file A that are similar in File B. Compare-Object $A $B does the comparing, but how to I go about deleting the items? File A yahoo.com google.com stackoverflow.com facebook.com twitter.com File B stackoverflow.com facebook.com After Compare: File A yahoo.com google.com twitter.com 回答1: You can remove the contents of file B from file A with something like this: $ref = Get-Content 'C:\path\to\fileB.txt' (Get-Content 'C:\path\to\fileA

问题 Background Users can type in a name and the system should match the text, even if the either the user input or the database field contains accented (UTF-8) characters. This is using the pg_trgm module. Problem The code resembles the following: SELECT t.label FROM the_table t WHERE label % 'fil' ORDER BY similarity( t.label, 'fil' ) DESC When the user types fil , the query matches filbert but not filé powder . (Because of the accented character?) Failed Solution #1 I tried to implement an

问题 It came to my attention that there a several ways to compare strings in Java. I just got in the habit ages ago to use equalsIgnoreCase to avoid having problems with case sensitive strings. Others on the other hand prefer passing everything in upper or lower case. From where I stand (even if technically I'm sitting), I don't see a real difference. Does anybody know if one practice is better than the other? And if so why? 回答1: Use equalsIgnoreCase because it's more readable than converting both

问题 I am trying to compare strings in bash. I already found an answer on how to do it on stackoverflow. In script I am trying, I am using the code submitted by Adam in the mentioned question: #!/bin/bash string='My string'; if [[ "$string" == *My* ]] then echo "It's there!"; fi needle='y s' if [[ "$string" == *"$needle"* ]]; then echo "haystack '$string' contains needle '$needle'" fi I also tried approach from ubuntuforums that you can find in 2nd post if [[ $var =~ regexp ]]; then #do something

问题 I'm sure this is a simple solution, just haven't found exactly what I needed. Using php, i have a variable $source. I wanna check if $source starts with 'http'. if ($source starts with 'http') { $source = "<a href='$source'>$source</a>"; } Thanks! 回答1: if (strpos($source, 'http') === 0) { $source = "<a href=\"$source\">$source</a>"; } Note I use === , not == because strpos returns boolean false if the string does not contain the match. Zero is falsey in PHP, so a strict equality check is

问题 Possible Duplicate: Are there any Fuzzy Search or String Similarity Functions libraries written for C#? What is the best way to compare 2 strings to see how similar they are? Examples: My String My String With Extra Words Or My String My Slightly Different String What I am looking for is to determine how similar the first and second string in each pair is. I would like to score the comparison and if the strings are similar enough, I would consider them a matching pair. Is there a good way to

问题 Is there a string similarity measure available in Python+Sqlite, for example with the sqlite3 module? Example of use case: import sqlite3 conn = sqlite3.connect(':memory:') c = conn.cursor() c.execute('CREATE TABLE mytable (id integer, description text)') c.execute('INSERT INTO mytable VALUES (1, "hello world, guys")') c.execute('INSERT INTO mytable VALUES (2, "hello there everybody")') This query should match the row with ID 1, but not the row with ID 2: c.execute('SELECT * FROM mytable

问题 I want to write a cmp -like function which compares two version numbers and returns -1 , 0 , or 1 based on their compared valuses. Return -1 if version A is older than version B Return 0 if version A and B are equivalent Return 1 if version A is newer than version B Each subsection is supposed to be interpreted as a number, therefore 1.10 > 1.1. Desired function outputs are mycmp('1.0', '1') == 0 mycmp('1.0.0', '1') == 0 mycmp('1', '1.0.0.1') == -1 mycmp('12.10', '11.0.0.0.0') == 1 ... And