Regular Expressions 101

Save & Share

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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

r"
"
gm

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

// include the latest version of the regex crate in your Cargo.toml extern crate regex; use regex::Regex; fn main() { let regex = Regex::new(r#"(?m)(?<=setText\()\"\"[.\n]*|\"\"(\n)*(?![\)\}\]])"#).unwrap(); let string = "hou_sticky = hou_parent.createStickyNote(\"__stickynote1\") hou_sticky.setText(\"\"To use the proxys you need to do: -bake every specific tree inside of the setup trees to a rs archive. - activate the visibility flag and load the rs archive in the proxy tab of the redshift parameter tab - make sure the setup trees are not visible at render time IMPORTANT: IF you dont want to render the trees with Displacement you have to deactivate Displacement in the Redshift Parameter TAB ofevery specific Setup Tree. Then you need to bake out the redshift proxy for each tree in the Setup Tree Sop Network too.\"\") hou_sticky.setTextSize(0) hou_parm.set(\"\") hou_node.setUserData(\"___Version___\", \"\") hou_parm_template2 = hou.ToggleParmTemplate(\"vex_strict\", \"Enforce Prototypes\", default_value=False, default_expression='off', default_expression_language=hou.scriptLanguage.Hscript) hou_parm_template2.setTags({\"autoscope\": \"0000000000000000\", \"script_callback\": \"\"})"; let substitution = "\\\"\\\"\\\""; // result will be a String with the substituted value let result = regex.replace_all(string, substitution); println!("{}", result); }

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 Rust, please visit: https://docs.rs/regex/latest/regex/