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Regular Expression
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(\d+ )([\w\W]+?)(?=((\r\n|\n|\r)$)|(^(\r\n|\n|\r))|^\s*$)
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gm
Input 1
1
New
1 Some line THis Some second line Some third line 2 Some fourth line Hello World Some fifth line 3 Some sfnskns line Some asasa line Some asasasa line 4 Some asasasasasasasvsvdv line Some sasascsvebndbd line Some csvsvgggeg line 5 Some 12 line Some 34 line 6 Some 56 line Some 7890 and some special characters like 1[2]1[2]2[]{{{#@@@@ line 7 Some 0q80r0r201;w]e;[;line Some ];f];[vvmnvkdvndkvndk line Some smclscsocsocscm line 8 Some 123243455634656 adada][]p[][] line Some 12-=12-1=+++ line 533 Some 313o1hsohvihis line Some sncscsicnsc line 2456 Mango Apple Veg 123 Onion Tomato
Substitution
1 Some line THis Some second line Some third line 2 Some fourth line Hello World Some fifth line 3 Some sfnskns line Some asasa line Some asasasa line 4 Some asasasasasasasvsvdv line Some sasascsvebndbd line Some csvsvgggeg line 5 Some 12 line Some 34 line 6 Some 56 line Some 7890 and some special characters like 1[2]1[2]2[]{{{#@@@@ line 7 Some 0q80r0r201;w]e;[;line Some ];f];[vvmnvkdvndkvndk line Some smclscsocsocscm line 8 Some 123243455634656 adada][]p[][] line Some 12-=12-1=+++ line 533 Some 313o1hsohvihis line Some sncscsicnsc line 2456 Mango Apple Veg 123 Onion Tomato