C# / JavaScript - Splitting a string / sequence into parts of equal length ; split after n number of characters ; split sequence into GFF / FASTA like structure

split_after_n_words.js

//www.lsauer.com 2012
//FASTA linear sequence
"MEIEKSNNGGSNPSAGEEFKDMIKGVTKFLMMVIFLGTIMLWIMMPTLTYRTKWLPHLRIKFGTSTYFGATGTTLFMYMFPMMVVACLGCVYLHFKNRKSPHHIDRETKGGVWSKLRKPMLVKGPLGIVSVTEITFLAMFVALLLWCFITYLRNSFATITPKSAAAHDESLWQAKLESAALRLGLIGNICLAFLFLPVARGSSLLPAMGLTSESSIKYHIWLGHMVMALFTVHGLCYIIYWASMHEISQMIMWDTKGVSNLAGEIALAAGLVMWATTYPKIRRRFFEVFFYTHYLYIVFMLFFVLHVGISFSFIALPGFYIFLVDRFLRFLQSRENVRLLAARILPSDTMELTFSKNSKLVYSPTSIMFVNIPSISKLQWHPFTITSSSKLEPEKLSIVIKKEGKWSTKLHQRLSSSDQIDRLAVSVEGPYGPASADFLRHEALVMVCGGSGITPFISVIRDLIATSQKETCKIPKITLICAFKKSSEISMLDLVLPLSGLETELSSDINIKIEAFITRDNDAGDEAKAGKIKTLWFKPSLSDQSISSILGPNSWLWLGAILASSFLIFMIIIGIITRYYIYPIDHNTNKIYSLTSKTIIYILVISVSIMATCSAAMLWNKKKYGKVESKQVQNVDRPSPTSSPTSSWGYNSLREIESTPQESLVQRTNLHFGERPNLKKLLLDVEGSSVGVLVCGPKKMRQKVAEICSSGLAENLHFESISFSW"
.split(/(.{50})/gm).filter(Boolean)
//there is also the neat CSS 'word-break:break-all;' - property and word-wrap, but neither will let you specify the exact amount of character to break to.

//result - useful for FASTA splitting
["MEIEKSNNGGSNPSAGEEFKDMIKGVTKFLMMVIFLGTIMLWIMMPTLTY", "RTKWLPHLRIKFGTSTYFGATGTTLFMYMFPMMVVACLGCVYLHFKNRKS",
 "PHHIDRETKGGVWSKLRKPMLVKGPLGIVSVTEITFLAMFVALLLWCFIT", "YLRNSFATITPKSAAAHDESLWQAKLESAALRLGLIGNICLAFLFLPVAR",  
 "GSSLLPAMGLTSESSIKYHIWLGHMVMALFTVHGLCYIIYWASMHEISQM", "IMWDTKGVSNLAGEIALAAGLVMWATTYPKIRRRFFEVFFYTHYLYIVFM",  
 "LFFVLHVGISFSFIALPGFYIFLVDRFLRFLQSRENVRLLAARILPSDTM", "ELTFSKNSKLVYSPTSIMFVNIPSISKLQWHPFTITSSSKLEPEKLSIVI", 
 "KKEGKWSTKLHQRLSSSDQIDRLAVSVEGPYGPASADFLRHEALVMVCGG", "SGITPFISVIRDLIATSQKETCKIPKITLICAFKKSSEISMLDLVLPLSG",
 "LETELSSDINIKIEAFITRDNDAGDEAKAGKIKTLWFKPSLSDQSISSIL", "GPNSWLWLGAILASSFLIFMIIIGIITRYYIYPIDHNTNKIYSLTSKTII",  
 "YILVISVSIMATCSAAMLWNKKKYGKVESKQVQNVDRPSPTSSPTSSWGY", "NSLREIESTPQESLVQRTNLHFGERPNLKKLLLDVEGSSVGVLVCGPKKM", 
 "RQKVAEICSSGLAENLHFESISFSW"]

//in GFF / GPFF (formatting

"MEIEKSNNGGSNPSAGEEFKDMIKGVTKFLMMVIFLGTIMLWIMMPTLTYRTKWLPHLRIKFGTSTYFGATGTTLFMYMFPMMVVACLGCVYLHFKNRKSPHHIDRETKGGVWSKLRKPMLVKGPLGIVSVTEITFLAMFVALLLWCFITYLRNSFATITPKSAAAHDESLWQAKLESAALRLGLIGNICLAFLFLPVARGSSLLPAMGLTSESSIKYHIWLGHMVMALFTVHGLCYIIYWASMHEISQMIMWDTKGVSNLAGEIALAAGLVMWATTYPKIRRRFFEVFFYTHYLYIVFMLFFVLHVGISFSFIALPGFYIFLVDRFLRFLQSRENVRLLAARILPSDTMELTFSKNSKLVYSPTSIMFVNIPSISKLQWHPFTITSSSKLEPEKLSIVIKKEGKWSTKLHQRLSSSDQIDRLAVSVEGPYGPASADFLRHEALVMVCGGSGITPFISVIRDLIATSQKETCKIPKITLICAFKKSSEISMLDLVLPLSGLETELSSDINIKIEAFITRDNDAGDEAKAGKIKTLWFKPSLSDQSISSILGPNSWLWLGAILASSFLIFMIIIGIITRYYIYPIDHNTNKIYSLTSKTIIYILVISVSIMATCSAAMLWNKKKYGKVESKQVQNVDRPSPTSSPTSSWGYNSLREIESTPQESLVQRTNLHFGERPNLKKLLLDVEGSSVGVLVCGPKKMRQKVAEICSSGLAENLHFESISFSW"
.split(/(.{10})/gm).filter(Boolean).map( function(e,i,a){ var pos=(i*10)+1; return (!(i%6)?'\n'+'    '.slice(0,4-(''+pos).length)+(pos)+' '+e:e)}).join(' ')
//>result
   1 MEIEKSNNGG SNPSAGEEFK DMIKGVTKFL MMVIFLGTIM LWIMMPTLTY RTKWLPHLRI 
  61 KFGTSTYFGA TGTTLFMYMF PMMVVACLGC VYLHFKNRKS PHHIDRETKG GVWSKLRKPM 
 121 LVKGPLGIVS VTEITFLAMF VALLLWCFIT YLRNSFATIT PKSAAAHDES LWQAKLESAA 
 181 LRLGLIGNIC LAFLFLPVAR GSSLLPAMGL TSESSIKYHI WLGHMVMALF TVHGLCYIIY 
 241 WASMHEISQM IMWDTKGVSN LAGEIALAAG LVMWATTYPK IRRRFFEVFF YTHYLYIVFM 
 301 LFFVLHVGIS FSFIALPGFY IFLVDRFLRF LQSRENVRLL AARILPSDTM ELTFSKNSKL 
 361 VYSPTSIMFV NIPSISKLQW HPFTITSSSK LEPEKLSIVI KKEGKWSTKL HQRLSSSDQI 
 421 DRLAVSVEGP YGPASADFLR HEALVMVCGG SGITPFISVI RDLIATSQKE TCKIPKITLI 
 481 CAFKKSSEIS MLDLVLPLSG LETELSSDIN IKIEAFITRD NDAGDEAKAG KIKTLWFKPS 
 541 LSDQSISSIL GPNSWLWLGA ILASSFLIFM IIIGIITRYY IYPIDHNTNK IYSLTSKTII 
 601 YILVISVSIM ATCSAAMLWN KKKYGKVESK QVQNVDRPSP TSSPTSSWGY NSLREIESTP 
 661 QESLVQRTNL HFGERPNLKK LLLDVEGSSV GVLVCGPKKM RQKVAEICSS GLAENLHFES 
 721 ISFSW

splitafter_n_words.cs

//lo sauer, 2012 - free use
//analog solution in C# and using LINQ for filtering empty elements
using System;
using System.Text.RegularExpressions;
Regex.Split(
"MEIEKSNNGGSNPSAGEEFKDMIKGVTKFLMMVIFLGTIMLWIMMPTLTYRTKWLPHLRIKFGTSTYFGATGTTLFMYMFPMMVVACLGCVYLHFKNRKSPHHIDRETKGGVWSKLRKPMLVKGPLGIVSVTEITFLAMFVALLLWCFITYLRNSFATITPKSAAAHDESLWQAKLESAALRLGLIGNICLAFLFLPVARGSSLLPAMGLTSESSIKYHIWLGHMVMALFTVHGLCYIIYWASMHEISQMIMWDTKGVSNLAGEIALAAGLVMWATTYPKIRRRFFEVFFYTHYLYIVFMLFFVLHVGISFSFIALPGFYIFLVDRFLRFLQSRENVRLLAARILPSDTMELTFSKNSKLVYSPTSIMFVNIPSISKLQWHPFTITSSSKLEPEKLSIVIKKEGKWSTKLHQRLSSSDQIDRLAVSVEGPYGPASADFLRHEALVMVCGGSGITPFISVIRDLIATSQKETCKIPKITLICAFKKSSEISMLDLVLPLSGLETELSSDINIKIEAFITRDNDAGDEAKAGKIKTLWFKPSLSDQSISSILGPNSWLWLGAILASSFLIFMIIIGIITRYYIYPIDHNTNKIYSLTSKTIIYILVISVSIMATCSAAMLWNKKKYGKVESKQVQNVDRPSPTSSPTSSWGYNSLREIESTPQESLVQRTNLHFGERPNLKKLLLDVEGSSVGVLVCGPKKMRQKVAEICSSGLAENLHFESISFSW"
, "(.{50})"
, RegexOptions.Multiline)
.Where(s => !string.IsNullOrEmpty(s))
.ToArray();
//> Result (courtesy of the great REPL Mono CS Shell2: http://www.mono-project.com/CsharpRepl )
{ "MEIEKSNNGGSNPSAGEEFKDMIKGVTKFLMMVIFLGTIMLWIMMPTLTY", "RTKWLPHLRIKFGTSTYFGATGTTLFMYMFPMMVVACLGCVYLHFKNRKS",
  "PHHIDRETKGGVWSKLRKPMLVKGPLGIVSVTEITFLAMFVALLLWCFIT", "YLRNSFATITPKSAAAHDESLWQAKLESAALRLGLIGNICLAFLFLPVAR", 
  "GSSLLPAMGLTSESSIKYHIWLGHMVMALFTVHGLCYIIYWASMHEISQM", "IMWDTKGVSNLAGEIALAAGLVMWATTYPKIRRRFFEVFFYTHYLYIVFM", 
  "LFFVLHVGISFSFIALPGFYIFLVDRFLRFLQSRENVRLLAARILPSDTM", "ELTFSKNSKLVYSPTSIMFVNIPSISKLQWHPFTITSSSKLEPEKLSIVI", 
  "KKEGKWSTKLHQRLSSSDQIDRLAVSVEGPYGPASADFLRHEALVMVCGG", "SGITPFISVIRDLIATSQKETCKIPKITLICAFKKSSEISMLDLVLPLSG", 
  "LETELSSDINIKIEAFITRDNDAGDEAKAGKIKTLWFKPSLSDQSISSIL", "GPNSWLWLGAILASSFLIFMIIIGIITRYYIYPIDHNTNKIYSLTSKTII", 
  "YILVISVSIMATCSAAMLWNKKKYGKVESKQVQNVDRPSPTSSPTSSWGY", "NSLREIESTPQESLVQRTNLHFGERPNLKKLLLDVEGSSVGVLVCGPKKM", 
  "RQKVAEICSSGLAENLHFESISFSW" 
}