Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
gm

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"^(\s*""[^""]+"")"; string substitution = @"\1:"; string input = @"""sound_materials"" { ""common"" { ""value"" ""0"" ""start_drag_sound"" ""ui.inv_pickup"" ""end_drag_sound"" ""ui.inv_drop"" ""equip_sound"" ""ui.inv_equip"" } ""chest"" { ""value"" ""1"" ""start_drag_sound"" ""ui.inv_pickup_chest"" ""end_drag_sound"" ""ui.inv_drop_chest"" } ""pennant"" { ""value"" ""2"" ""start_drag_sound"" ""ui.inv_pickup_pennant"" ""end_drag_sound"" ""ui.inv_drop_pennant"" } ""key"" { ""value"" ""3"" ""start_drag_sound"" ""ui.inv_pickup_key"" ""end_drag_sound"" ""ui.inv_drop_key"" } ""metal_small"" { ""value"" ""4"" ""start_drag_sound"" ""ui.inv_pickup_metalsmall"" ""end_drag_sound"" ""ui.inv_drop_metalsmall"" ""equip_sound"" ""ui.inv_equip_metalsmall"" } ""metal_armor"" { ""value"" ""5"" ""start_drag_sound"" ""ui.inv_pickup_metalarmour"" ""end_drag_sound"" ""ui.inv_drop_metalarmour"" ""equip_sound"" ""ui.inv_equip_metalarmour"" } ""metal_blade"" { ""value"" ""6"" ""start_drag_sound"" ""ui.inv_pickup_metalblade"" ""end_drag_sound"" ""ui.inv_drop_metalblade"" ""equip_sound"" ""ui.inv_equip_metalblade"" } ""metal_heavy"" { ""value"" ""7"" ""start_drag_sound"" ""ui.inv_pickup_metalheavy"" ""end_drag_sound"" ""ui.inv_drop_metalheavy"" ""equip_sound"" ""ui.inv_equip_metalheavy"" } ""staff_or_blunt"" { ""value"" ""8"" ""start_drag_sound"" ""ui.inv_pickup_staff"" ""end_drag_sound"" ""ui.inv_drop_staff"" ""equip_sound"" ""ui.inv_equip_staff"" } ""robes"" { ""value"" ""9"" ""start_drag_sound"" ""ui.inv_pickup_robes"" ""end_drag_sound"" ""ui.inv_drop_robes"" ""equip_sound"" ""ui.inv_equip_robes"" } ""leather"" { ""value"" ""10"" ""start_drag_sound"" ""ui.inv_pickup_leather"" ""end_drag_sound"" ""ui.inv_drop_leather"" ""equip_sound"" ""ui.inv_equip_leather"" } ""quiver"" { ""value"" ""11"" ""start_drag_sound"" ""ui.inv_pickup_quiver"" ""end_drag_sound"" ""ui.inv_drop_quiver"" ""equip_sound"" ""ui.inv_equip_quiver"" } ""stone"" { ""value"" ""12"" ""start_drag_sound"" ""ui.inv_pickup_stone"" ""end_drag_sound"" ""ui.inv_drop_stone"" ""equip_sound"" ""ui.inv_equip_stone"" } ""wood"" { ""value"" ""13"" ""start_drag_sound"" ""ui.inv_pickup_wood"" ""end_drag_sound"" ""ui.inv_drop_wood"" ""equip_sound"" ""ui.inv_equip_wood"" } ""bone"" { ""value"" ""14"" ""start_drag_sound"" ""ui.inv_pickup_bone"" ""end_drag_sound"" ""ui.inv_drop_bone"" ""equip_sound"" ""ui.inv_equip_bone"" } ""jug"" { ""value"" ""15"" ""start_drag_sound"" ""ui.inv_pickup_jug"" ""end_drag_sound"" ""ui.inv_drop_jug"" ""equip_sound"" ""ui.inv_equip_jug"" } ""gun"" { ""value"" ""16"" ""start_drag_sound"" ""ui.inv_pickup_gun"" ""end_drag_sound"" ""ui.inv_drop_gun"" ""equip_sound"" ""ui.inv_equip_gun"" } ""highvalue"" { ""value"" ""17"" ""start_drag_sound"" ""ui.inv_pickup_highvalue"" ""end_drag_sound"" ""ui.inv_drop_highvalue"" ""equip_sound"" ""ui.inv_equip_highvalue"" } }"; RegexOptions options = RegexOptions.Multiline; Regex regex = new Regex(pattern, options); string result = regex.Replace(input, substitution); } }

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx