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PO.NET Regex isMatch vs Matches question
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copied!<p>yes it's <em>another</em> .net regex question :) (please excuse the long waffle leading up to the actual question)</p> <p>I'm allowing users to use simple date/time macros for entering dates quickly (they don't want a date picker)</p> <p>for example they can enter:<br> <code>d +1d -2h</code><br> this will give them a date time string of todays's date, plus one day, minus two hours.</p> <p>anyways I've created a regex to match these which works fine (probably not the best way to do it but it works!):<br> <code>\b[DTdt]( *[+-] *[1-9][0-9]* *[dDhHmMwW])*\b</code></p> <p>as you've probably guessed i'm using the regex to validate these entries before parsing them to calculate the resulting datetime. At first I used something like:</p> <pre><code>Regex rgxDateTimeMacro = new Regex(@"\b[DTdt]( *[+-] *[1-9][0-9]* *[dDhHmMwW])*\b"); if(rgxDateTimeMacro.isMatch(strInput)){ ...string passes... } </code></pre> <p>I then quickly realised that isMatch returns true if there's <em>any</em> matches in the passed string,<br> <code>d +1d +1</code><br> would return true ^__^</p> <p>so i changed it around to do something like this:</p> <pre><code>Regex rgxDateTimeMacro = new Regex(@"\b[DTdt]( *[+-] *[1-9][0-9]* *[dDhHmMwW])*\b"); MatchCollection objMatches = rgxDateTimeMacro.Matches(strInput); if (objMatches.Count > 0) { // to pass.. we need a match which is the same length as the input string... foreach (Match m in objMatches) { if (m.Length == strInput.Length) { ...string passes... } } } </code></pre> <p>now this works fine, but my question is this: is there a simpler way to check if a string (the <em>whole</em> string) matches a regex? I've had a google around, but cant seem to find an obvious answer.</p> <p>hope this makes sense</p> <p>Pete</p> <hr> <p>UPDATE</p> <p>thanks for all the quick answers, ^$ does the trick : ) </p> <p>(showing my inexperience with regexes ^__^)</p>

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