string-comparison - w3toppers.com

Complex “Contains” string comparison

You could use an appropriate CompareInfo and then CompareInfo.IndexOf(string, string, CompareOptions) and check the result against -1. Sample: using System; using System.Globalization; class Program { static void Main() { var compareInfo = CultureInfo.InvariantCulture.CompareInfo; var options = CompareOptions.IgnoreCase | CompareOptions.IgnoreSymbols | CompareOptions.IgnoreNonSpace; var haystack = “bla Lé OnAr d/o bla”; var needle = “leonardo”; var index … Read more

String comparison with logical operator in Java

You shouldn’t use == because it does something else then you think. In this case, the “hello” is saved (Read up on string interning), so it is “coincidence” that it is the same thing as your stirng. == checks if two things are EXACTLY the same thing, not if they have the same content. This … Read more

how to compare two strings in javascript if condition

You could check every option. if (compare === “page1” || compare === “page2”) { Or you could use an array and check with an existential quantifier like Array#some against, like if ([“page1”, “page2”].some(a => a === compare)) { var compare = “page3”; if (compare === “page1” || compare === “page2”) { document.body.innerHTML = “github url”; … Read more

strcmp or string::compare?

For C++, use std::string and compare using string::compare. For C use strcmp. If your (i meant your programs) strings (for some weird reason) aren’t nul terminated, use strncmp instead. But why would someone not use something as simple as == for std::string ?

Check if string is a punctuation character

Here is one way to do it with regular expressions: if (Pattern.matches(“\\p{Punct}”, str)) { … } The \p{Punct} regular expression is a POSIX pattern representing a single punctuation character.

Check if variable starts with ‘http’

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 necessary to remove ambiguity. Reference: http://php.net/strpos http://php.net/operators.comparison

Why does the default string comparer fail to maintain transitive consistency?

Microsoft Connect Discussion Here is some code to workaround: static int CompareStringUsingSortKey(string s1, string s2) { SortKey sk1 = CultureInfo.InvariantCulture.CompareInfo.GetSortKey(s1); SortKey sk2 = CultureInfo.InvariantCulture.CompareInfo.GetSortKey(s2); return SortKey.Compare(sk1, sk2); }

Comparing a string with the empty string (Java)

s1 == “” is not reliable as it tests reference equality not object equality (and String isn’t strictly canonical). s1.equals(“”) is better but can suffer from null pointer exceptions. Better yet is: “”.equals(s1) No null pointer exceptions. EDIT: Ok, the point was asked about canonical form. This article defines it as: Suppose we have some … Read more

Check if one string is a prefix of another

Use std::mismatch. Pass in the shorter string as the first iterator range and the longer as the second iterator range. The return is a pair of iterators, the first is the iterator in the first range and the second, in the second rage. If the first is end of the first range, then you know … Read more

how to compare list elements(type string) and string(in request scope) using struts 2 tags

With the IteratorStatus object: <s:iterator value=”lis” status=”ctr”> <s:property /> <s:if test=”%{#request.str.equals(lis[#ctr.index])}”> -> This value from “lis” is equal to the value of “str” </s:if> <br/> </s:iterator> With the var parameter: <s:iterator value=”lis” var=”currentValue”> <s:property /> <s:if test=”%{#request.str.equals(#currentValue)}”> -> This value from “lis” is equal to the value of “str” </s:if> <br/> </s:iterator> With the top … Read more