Javascript split regex not working

Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I want the ability to split a date via javascript splitting either by a '-','.

You need the put the characters you wish to split on in a character classwhich tells the regular expression engine "any of these characters is a match".

javascript split regex not working

For your purposes, this would look like:. Although dashes have special meaning in character classes as a range specifier ie [a-z] means the same as [abcdefghijklmnopqrstuvwxyz]if you put it as the last thing in the class it is taken to mean a literal dash and does not need to be escaped.

With "", it would split each time "-2" is encountered, because the dash matches and the dot matches "2".

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Javascript split regex question Ask Question. Asked 10 years, 5 months ago. Active 1 year, 1 month ago. Viewed k times. Improve this question. Craig Craig 2, 8 8 gold badges 21 21 silver badges 24 24 bronze badges. Active Oldest Votes. For your purposes, this would look like: date. Improve this answer. Daniel Vandersluis Daniel Vandersluis You could also mention that a dot doesn't have any special meaning inside of a character class - instead of acting as a wildcard character which wouldn't make any senseit acts as a literal.

Jo3y Jo3y 1 1 silver badge 3 3 bronze badges. Brandon Allan Ruin Allan Ruin 4, 6 6 gold badges 30 30 silver badges 40 40 bronze badges. Put a line break before your code and the 4 spaces will format it properly. Then split it on anything but numbers: date.

Bobzius Bobzius 81 2 2 bronze badges. Why the g-flag? Omar Omar It is often used like so:. As you can see above, the replace method accepts two arguments: the string to be replaced, and what the string would be replaced with. The use of. What if we're concerned with a pattern instead?

Maybe, a number, two letters, and the word "foo" or three symbols used together? RegEx can be effectively used to recreate patterns. So combining this with. This syntax serves as a pattern where any parts of the string that match it will be replaced with the new substring. Regex already offers that with the g global flag, and the same can be used with replace. Here's how:.

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The regex matches parts of the string that are exactly 3 consecutive numbers. But the last 5 does not match the pattern. The result is that JavaScrip5t shows how the patterns are correctly matched and replaces with the new substring an empty string.

The case flag - i can also be used. This means you can replace case-insensitive patterns. Here's how it is used:. But with the usage of the i flag, as seen in the second syntax, the string is as expected - replaced. Which means you can split a string not just at substrings that match exact characters, but also patterns. The string was split at 64a because that substring matches the regex specified.

Note that the global flag - g - in split is irrelevant, unlike the i flag and other flags. This is because split splits the string at the several points the regex matches. RegEx makes replace ing strings in JavaScript more effective, powerful, and fun.

You're not only restricted to exact characters but patterns and multiple replacements at once. In this article, we've seen how they work together using a few examples.The split method is used to split a string into an array of substrings, and returns the new array.

Tip: If an empty string "" is used as the separator, the string is split between each character. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:. LOG IN. New User? Sign Up For Free! Forgot password? Get your certification today! View options. HOW TO.

Javascript and regex: split string and keep the separator

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Specifies the character, or the regular expression, to use for splitting the string. If omitted, the entire string will be returned an array with only one item. An integer that specifies the number of splits, items after the split limit will not be included in the array.The split method breaks the specified string by the given regular expression delimiter and returns an array. The array contains substrings of the specified string after splitting.

That is, limit the number of splits in the given string by using the limit argument. The limit is given as int. For demonstrating the Java string split method, a string object is created and assigned a value. In the split method, the delimiter used for breaking the string is a space character. As no limit parameter is provided, so complete string will break:.

You see, the string is broken into four pieces. The for loop is used to iterate through the returned array for displaying its items. You just need to break this from first dash character while keeping the second intact. This is where limit parameter can play its role. Otherwise, simply using the split method will break the string completely; in that case, in three pieces.

See the code below:. Similarly, you may use dot. Suppose, you have long paragraphs and the requirement is to break the paragraphs into sentences based on full stops. Here is how you may do this:. Note: the simple dot will not work. You have to escape the dot in order to break the string paragraphs based on full stop.

In some scenarios, you may need to split a string for multiple delimiters.


For example, break the string with space, commas, hyphens, or other characters in one call. As such, the Java split method performs split based on given regular expression, so you may create such a regex that may accommodate all. See this example where I will split the string with space, comma, dot, and dash by using regex:.Wondering how to split the string in javaScript?

It defines the character or regular expression. It defines how many times to split a matched value. If the limit is not specified, it will split at all matched values and return an array. Refer to the below script for the string input parameter and output field. Convert Java InputStream from File. In JavaScript, you can get element by id and split. Here is the sample javascript split function to split a string on the number of elements.

How to split the string on the specified index and return the values by using the string split js method.

javascript split regex not working

Since here we are trying to split the variable test Hello Javascript which is not a string type. The result will be [Hello,JavaScript] On newline The following example will return an array of strings upon using the js split method on the newline. Want to deep dive into JavaScript programming language?

Looking for some Java articles, Check out here on Array List conversions. Thanks, Pauline, to love our content, you can also check our how to sort ArrayList in java.

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JavaScript split string method splits a string object to an array of strings. This is by breaking up the string into substrings. Moreover, JS split method is pretty much like Java split method. Using JS split method, we can perform the following. Contents 1 What is the JavaScript split string method? Pauline Lotzer on May 17, at pm.Regular expressions are patterns used to match character combinations in strings. In JavaScript, regular expressions are also objects. This chapter describes JavaScript regular expressions.

Using a regular expression literal, which consists of a pattern enclosed between slashes, as follows:. Regular expression literals provide compilation of the regular expression when the script is loaded. Or calling the constructor function of the RegExp object, as follows:. Using the constructor function provides runtime compilation of the regular expression. Use the constructor function when you know the regular expression pattern will be changing, or you don't know the pattern and are getting it from another source, such as user input.

javascript split regex not working

The last example includes parentheses, which are used as a memory device. The match made with this part of the pattern is remembered for later use, as described in Using groups.

javascript split regex not working

Simple patterns are constructed of characters for which you want to find a direct match. Such a match would succeed in the strings "Hi, do you know your abc's? There is no match in the string "Grab crab" because while it contains the substring "ab c"it does not contain the exact substring "abc". When the search for a match requires something more than a direct match, such as finding one or more b's, or finding white space, you can include special characters in the pattern.

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The following pages provide lists of the different special characters that fit into each category, along with descriptions and examples. If you want to look at all the special characters that can be used in regular expressions in a single table, see the following:. Character classes. Groups and ranges. Note: A larger cheatsheet is also available only aggregating parts of those individual articles. To match a literal backslash, you need to escape the backslash. If using the RegExp constructor with a string literal, remember that the backslash is an escape in string literals, so to use it in the regular expression, you need to escape it at the string literal level.

If escape strings are not already part of your pattern you can add them using String. The "g" after the regular expression is an option or flag that performs a global search, looking in the whole string and returning all matches. It is explained in detail below in Advanced Searching With Flags. Why isn't this built into JavaScript? Parentheses around any part of the regular expression pattern causes that part of the matched substring to be remembered. Once remembered, the substring can be recalled for other use.

See Groups and ranges for more details. Regular expressions are used with the RegExp methods test and exec and with the String methods matchreplacesearchand split.The split method divides a String into an ordered list of substrings, puts these substrings into an array, and returns the array. The division is done by searching for a pattern; where the pattern is provided as the first parameter in the method's call. The source for this interactive example is stored in a GitHub repository. Warning: When the empty string "" is used as a separator, the string is not split by user-perceived characters grapheme clusters or unicode characters codepointsbut by UTF codeunits.

This destroys surrogate pairs. A non-negative integer specifying a limit on the number of substrings to be included in the array. If provided, splits the string at each occurrence of the specified separatorbut stops when limit entries have been placed in the array.

Any leftover text is not included in the array at all. An Array of strings, split at each point where the separator occurs in the given string.

When found, separator is removed from the string, and the substrings are returned in an array. If separator is a regular expression with capturing parentheses, then each time separator matches, the results including any undefined results of the capturing parentheses are spliced into the output array. When the string is empty, split returns an array containing one empty string, rather than an empty array.

If the string and separator are both empty strings, an empty array is returned.

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The following example defines a function that splits a string into an array of strings using separator. After splitting the string, the function logs messages indicating the original string before the splitthe separator used, the number of elements in the array, and the individual array elements. In the following example, split looks for zero or more spaces, followed by a semicolon, followed by zero or more spaces—and, when found, removes the spaces and the semicolon from the string.

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This logs two lines; the first line logs the original string, and the second line logs the resulting array. In the following example, split looks for spaces in a string and returns the first 3 splits that it finds.

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If separator is a regular expression that contains capturing parenthesesmatched results are included in the array. It doesn't work if the string contains grapheme clusters, even when using a unicode-aware split. The compatibility table in this page is generated from structured data. Skip to main content Skip to search String.

For example, a string containing tab separated values TSV could be parsed by passing a tab character as the separator, like this: myString. If separator contains multiple characters, that entire character sequence must be found in order to split. If separator is omitted or does not occur in strthe returned array contains one element consisting of the entire string. If separator appears at the beginning or end of the string, it still has the effect of splitting.

The result is an empty i. If separator is an empty string ""str is converted to an array of each of its UTF "characters".

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