trim | 易学教程

Does the MySQL TRIM function not trim line breaks or carriage returns?

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问题 From my experiments, it does not appear to do so. If this is indeed true, what is the best method for removing line breaks? I'm currently experimenting with the parameters that TRIM accepts of the character to remove, starting with trimming \n and \r . 回答1: Trim() in MySQL only removes spaces. I don't believe there is a built-in way to remove all kinds of trailing and leading whitespace in MySQL, unless you repeatedly use Trim() . I suggest you use another language to clean up your current

IE8 and JQuery's trim()

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问题 I am making use of trim() like so: if($('#group_field').val().trim()!=''){ Where group_field is an input element of type text. This works in Firefox but when I try it on IE8 it gives me this error: Message: Object doesn't support this property or method When I remove the trim(), it works fine on IE8. I thought the way I am using trim() is correct? Thanks all for any help 回答1: Try this instead: if($.trim($('#group_field').val()) != ''){ More Info: http://api.jquery.com/jQuery.trim/ 回答2: You

How to extend C# built-in types, like String?

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问题 Greetings everyone... I need to Trim a String . But I want to remove all the repeated blank spaces within the String itself, not only at the end or at the start of it. I could do it with a method like: public static string ConvertWhitespacesToSingleSpaces(string value) { value = Regex.Replace(value, @"\s+", " "); } Which I got from here. But I want this piece of code to be called within the String.Trim() itself, so I think I need to extend or overload or override the Trim method... Is there a

How to remove new line characters from data rows in mysql?

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I can loop through all of the rows in a php script and do UPDATE mytable SET title = "'.trim($row['title']).'" where id = "'.$row['id'].'"; and trim can remove \n But I was just wondering if something same could be done in one query? update mytable SET title = TRIM(title, '\n') where 1=1 will it work? I can then just execute this query without requiring to loop through! thanks (PS: I could test it but table is quite large and dont want to mess with data, so just thought if you have tested something like this before) your syntax is wrong: update mytable SET title = TRIM(TRAILING '\n' FROM title

How to select first 10 words of a sentence?

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How do I, from an output, only select the first 10 words? implode(' ', array_slice(explode(' ', $sentence), 0, 10)); To add support for other word breaks like commas and dashes, preg_match gives a quick way and doesn't require splitting the string: function get_words($sentence, $count = 10) { preg_match("/(?:\w+(?:\W+|$)){0,$count}/", $sentence, $matches); return $matches[0]; } As Pebbl mentions, PHP doesn't handle UTF-8 or Unicode all that well, so if that is a concern then you can replace \w for [^\s,\.;\?\!] and \W for [\s,\.;\?\!] . Pebbl Simply splitting on spaces will function

Java - Trim leading or trailing characters from a string?

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问题 How can I trim the leading or trailing characters from a string in java? For example, the slash character "/" - I'm not interested in spaces, and am looking to trim either leading or trailing characters at different times. 回答1: You could use Leading: System.out.println("//test/me".replaceAll("^/+", "")); Trailing: System.out.println("//test/me//".replaceAll("/+$", "")); 回答2: You can use Apache StringUtils.stripStart to trim leading characters, or StringUtils.stripEnd to trim trailing

What is a good alternative of LTRIM and RTRIM in Java?

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问题 What is a good alternative of JavaScript ltrim() and rtrim() functions in Java? 回答1: With a regex you could write: String s = ... String ltrim = s.replaceAll("^\\s+",""); String rtrim = s.replaceAll("\\s+$",""); If you have to do it often, you can create and compile a pattern for better performance: private final static Pattern LTRIM = Pattern.compile("^\\s+"); public static String ltrim(String s) { return LTRIM.matcher(s).replaceAll(""); } From a performance perspective, a quick micro

Trim audio with iOS

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问题 I want to implement a feature that lets the user trim an audio file (.caf) which he perviously recorded. The recording part already works, but how can i add a trimming feature similar to the one in the Voicememos app. Is there an api for the audio trimmer apple uses? Any help would be great... 回答1: How about using the AVFoundation? Import the audio file into an AVAsset (composition etc), then you can export it - setting preferred time + duration - to a file. I wrote a stock function awhile

How do I trim whitespace from a string?

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How do I remove leading and trailing whitespace from a string in Python? For example: " Hello " --> "Hello" " Hello" --> "Hello" "Hello " --> "Hello" "Bob has a cat" --> "Bob has a cat" Brian Just one space, or all such spaces? If the second, then strings already have a .strip() method: >>> ' Hello '.strip() 'Hello' >>> ' Hello'.strip() 'Hello' >>> 'Bob has a cat'.strip() 'Bob has a cat' >>> ' Hello '.strip() # ALL spaces at ends removed 'Hello' If you need only to remove one space however, you could do it with: def strip_one_space(s): if s.endswith(" "): s = s[:-1] if s.startswith(" "): s = s

PHP ltrim behavior with character list

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问题 I was trying to achieve stripping off some beginning part from a string using php ltrim function. It works fine until it get a i character after colon : . if it find i after colon it simply ignore the i character. I know it can be done with substr or any other way but I want to know why its happening with trim. For example. ltrim(\'mailto:bob@example.com\',\'mailto:\'); the above function will return bob@example.com but if I put i after colon.. for example ltrim(\'mailto:info@example.com\',\