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List item trimmer

World's simplest list tool

This is a super simple browser-based application that trims items in a list. It can remove unnecessary spaces, tabs, and line breaks from the left and/or right side of each item. It works with simple lists that use a single item separator symbol and also complex lists that use multi-symbol patterns as item separators. Created by list geeks from team Browserling.
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Separator for the Input List
A specific symbol is used to separate input items.
A multi-character pattern is that can be matched with a regex is used to separate input items.
Specify the character or regex that separates list items here.
Separator for the Output List
Specify a character, multiple characters, or a short string that will separate output list items.
Trimming Side
Remove whitespaces from the left side of list items.
Remove whitespaces from the right side of list items.
List item trimmer tool What is a list item trimmer?
With this utility, you can clean up excess whitespaces that surround list items. You can trim list items from both the left and right side (or optionally, just from one side). The trimming method does not affect printable characters and whitespaces in the middle of items. It only removes invisible leading and trailing spaces, tabs, and newlines. By default, the program separates the list items via a specific character, which is usually a comma, a semicolon, or a dash (you can change this input separator character in the options). If the input list uses several different separator characters or a changing multi-character pattern between the items, then you can switch to the regular expression separator mode. In this case, you can enter a regular expression in the same field as a specific character and the regexp will find these more complicated separators. After removing whitespaces, the program returns a cleaned list of the same items. The new items can have a new separator format that you can specify in the options. Listabulous!
List item trimmer examples Click to use
List of Leap Years
In this example, we apply the trimming algorithm on a list of 21st century leap years. To match the input list format, we select the "Character Split Mode" and enter a slash symbol in the item delimiter field. The list is in a dirty state and many of the items are surrounded by spaces, tabs, and even newlines on both sides. To clean it up and trim list elements, we enable pre- and post-trim options. The pre-trim option (also known as left-trim) cleans the beginning of each item and the post-trim (also known as right-trim) option cleans the end of each item. For the trimmed output list, we enter a pipe character in the output delimiter field and get a super clean pipe-separated list of leap years.
2004 / 2008 / 2012 / 2016 / 2020 / 2024 / 2028 / 2032 / 2036 / 2040 / 2044 / 2048 / 2052 / 2056 / 2060 / 2064 / 2068 / 2072 / 2076 / 2080 / 2084 / 2088 / 2092 / 2096
2004|2008|2012|2016|2020|2024|2028|2032|2036|2040|2044|2048|2052|2056|2060|2064|2068|2072|2076|2080|2084|2088|2092|2096
Required options
These options will be used automatically if you select this example.
A specific symbol is used to separate input items.
Specify the character or regex that separates list items here.
Specify a character, multiple characters, or a short string that will separate output list items.
Remove whitespaces from the left side of list items.
Remove whitespaces from the right side of list items.
List of Chemical Elements
This example loads Mendeleev's periodic table of chemical elements as the input. Unfortunately, the elements are chaotically surrounded by trailing whitespaces, which makes the table ugly and unusable for scientific publishing. What's worse, sometimes there are commas between the elements, sometimes semicolons, and sometimes dots. To catch all these delimiters, we switch to the "Regexp Delimiter Mode" and set the regular expression equal to "/[,;.]/". Once elements are found, we remove spaces from the right side of the elements and create a new element table that's separated by commas.
H , He ; Li, Be ; B , C , N , O , F, Ne ; Na , Mg . Al, Si, P, S, Cl, Ar , K, Ca , Sc , Ti, V, Cr , Mn , Fe ; Co , Ni, Cu , Zn , Ga , Ge ; As, Se ; Br , Kr , Rb , Sr , Y, Zr , Nb , Mo , Tc , Ru , Rh , Pd , Ag . Cd , In , Sn , Sb , Te ; I, Xe ; Cs, Ba , La , Ce ; Pr , Nd , Pm , Sm , Eu , Gd , Tb , Dy, Ho , Er , Tm , Yb , Lu , Hf, Ta , W, Re ; Os, Ir , Pt, Au , Hg . Tl, Pb , Bi, Po , At, Rn , Fr , Ra , Ac , Th , Pa , U , Np, Pu , Am , Cm , Bk, Cf, Es, Fm , Md , No , Lr , Rf, Db , Sg . Bh , Hs, Mt
H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Te, I, Xe, Cs, Ba, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb, Bi, Po, At, Rn, Fr, Ra, Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No, Lr, Rf, Db, Sg, Bh, Hs, Mt
Required options
These options will be used automatically if you select this example.
A multi-character pattern is that can be matched with a regex is used to separate input items.
Specify the character or regex that separates list items here.
Specify a character, multiple characters, or a short string that will separate output list items.
Remove whitespaces from the left side of list items.
Remove whitespaces from the right side of list items.
Pro tips Master online list tools
You can pass input to this tool via ?input query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!
https://onlinelisttools.com/trim-list-items?input=%0A2004%09%2F%202008%20%20%2F%202012%09%2F%202016%20%20%2F%0A%202020%20%2F%202024%09%2F%202028%20%20%2F%202032%09%2F%202036%20%20%2F%202040%20%2F%202044%09%2F%202048%20%20%2F%202052%09%2F%202056%0A%20%20%0A%20%20%0A%20%20%2F%202060%20%2F%202064%09%2F%202068%20%20%2F%202072%09%2F%202076%20%20%2F%202080%20%2F%202084%09%2F%202088%20%20%2F%202092%09%2F%202096%0A%0A&string-separator=true&input-separator=%2F&output-separator=%7C&left-trim=true&right-trim=true
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