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"
"
g

Test String

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#"([A-Z0-9-]+)\.txt:NAME:\s\"module\s\w+\s([0-9/]+)\",\sDESCR:\s\"(.+)\""#).unwrap(); let string = "RMAGPGE-PGBP01-01.txt:NAME: \"module R0\", DESCR: \"ASR 900 Route Switch Processor 2, Base Scale, 128Gbps\" RMAGPGE-PGIG01-01.txt:NAME: \"module R0\", DESCR: \"ASR 903 Route Switch Processor 1, Base Scale, 55Gbps\" RMAGPGE-PGIG01-01.txt:NAME: \"module R1\", DESCR: \"ASR 903 Route Switch Processor 1, Base Scale, 55Gbps\" RMAGPUI-PLIG01-01.txt:NAME: \"module R0\", DESCR: \"ASR 900 Route Switch Processor 2, Base Scale, 128Gbps\" RMAGPUI-PLIG01-01.txt:NAME: \"module R1\", DESCR: \"ASR 900 Route Switch Processor 2, Base Scale, 128Gbps\" RMAGPUI-PLMD00-01.txt:NAME: \"module R0\", DESCR: \"ASR 900 Route Switch Processor 2, Base Scale, 128Gbps\" RMAGPUI-PLMD00-01.txt:NAME: \"module R1\", DESCR: \"ASR 900 Route Switch Processor 2, Base Scale, 128Gbps\" RMAGPUI-PLMI00-01.txt:NAME: \"module R0\", DESCR: \"ASR 900 Route Switch Processor 2, Base Scale, 128Gbps\" RMAGPUI-PLMI00-01.txt:NAME: \"module R1\", DESCR: \"ASR 900 Route Switch Processor 2, Base Scale, 128Gbps\" RMAGRJO-CGD01-01.txt:NAME: \"module 0/RSP0/CPU0\", DESCR: \"ASR9K Route Switch Processor with 440G/slot Fabric and 12GB\" RMAGRJO-CGD01-01.txt:NAME: \"module 0/RSP1/CPU0\", DESCR: \"ASR9K Route Switch Processor with 440G/slot Fabric and 12GB\" RMAGRJO-CGD01-01.txt:NAME: \"module 0/0/CPU0\", DESCR: \"160G Modular Linecard, Service Edge Optimized\" RMAGRJO-CGD01-01.txt:NAME: \"module 0/0/0\", DESCR: \"ASR 9000 8-port 10GE Modular Port Adapter\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/0/0\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/0/1\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/0/2\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/0/3\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/0/4\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/0/5\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/0/6\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/0/7\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module 0/0/1\", DESCR: \"ASR 9000 8-port 10GE Modular Port Adapter\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/1/2\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/1/3\", DESCR: \"10GBASE-ZR SFP+, SMF 80km\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/1/4\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/1/5\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/1/6\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/0/1/7\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module 0/1/CPU0\", DESCR: \"160G Modular Linecard, Service Edge Optimized\" RMAGRJO-CGD01-01.txt:NAME: \"module 0/1/0\", DESCR: \"ASR 9000 8-port 10GE Modular Port Adapter\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/0/0\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/0/1\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/0/2\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/0/3\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/0/4\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/0/5\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/0/6\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/0/7\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module 0/1/1\", DESCR: \"ASR 9000 8-port 10GE Modular Port Adapter\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/1/2\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/1/3\", DESCR: \"10GBASE-ZR SFP+, SMF 80km\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/1/4\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/1/5\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/1/6\", DESCR: \"10GBASE-ZR SFP+, SMF 80km\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/1/1/7\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module 0/2/CPU0\", DESCR: \"160G Modular Linecard, Service Edge Optimized\" RMAGRJO-CGD01-01.txt:NAME: \"module 0/2/0\", DESCR: \"ASR 9000 8-port 10GE Modular Port Adapter\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/2/0/0\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/2/0/1\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/2/0/2\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/2/0/3\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/2/0/4\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/2/0/5\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/2/0/6\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/2/0/7\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module 0/3/CPU0\", DESCR: \"160G Modular Linecard, Service Edge Optimized\" RMAGRJO-CGD01-01.txt:NAME: \"module 0/3/0\", DESCR: \"ASR 9000 8-port 10GE Modular Port Adapter\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/3/0/0\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/3/0/1\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/3/0/2\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/3/0/3\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/3/0/4\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/3/0/5\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/3/0/6\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-CGD01-01.txt:NAME: \"module mau 0/3/0/7\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-GDL01-01.txt:NAME: \"module 0/RSP0/CPU0\", DESCR: \"ASR9K Route Switch Processor with 440G/slot Fabric and 12GB\" RMAGRJO-GDL01-01.txt:NAME: \"module 0/RSP1/CPU0\", DESCR: \"ASR9K Route Switch Processor with 440G/slot Fabric and 12GB\" RMAGRJO-GDL01-01.txt:NAME: \"module 0/0/CPU0\", DESCR: \"160G Modular Linecard, Service Edge Optimized\" RMAGRJO-GDL01-01.txt:NAME: \"module 0/0/0\", DESCR: \"ASR 9000 8-port 10GE Modular Port Adapter\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/0/0\", DESCR: \"10GBASE-ZR SFP+, SMF 80km\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/0/1\", DESCR: \"10GBASE-ZR SFP+, SMF 80km\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/0/2\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/0/3\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/0/4\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/0/5\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/0/6\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/0/7\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-GDL01-01.txt:NAME: \"module 0/0/1\", DESCR: \"ASR 9000 8-port 10GE Modular Port Adapter\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/1/0\", DESCR: \"10GBASE-ZR SFP+, SMF 80km\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/1/1\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/1/2\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/1/3\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/1/4\", DESCR: \"10GBASE-ZR SFP+, SMF 80km\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/1/5\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/1/6\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/0/1/7\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-GDL01-01.txt:NAME: \"module 0/1/CPU0\", DESCR: \"160G Modular Linecard, Service Edge Optimized\" RMAGRJO-GDL01-01.txt:NAME: \"module 0/1/0\", DESCR: \"ASR 9000 8-port 10GE Modular Port Adapter\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/0/0\", DESCR: \"10GBASE-ZR SFP+, SMF 80km\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/0/1\", DESCR: \"10GBASE-ZR SFP+, SMF 80km\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/0/2\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/0/3\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/0/4\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/0/5\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/0/6\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/0/7\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-GDL01-01.txt:NAME: \"module 0/1/1\", DESCR: \"ASR 9000 8-port 10GE Modular Port Adapter\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/1/0\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/1/1\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/1/2\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/1/3\", DESCR: \"10GBASE-ZR SFP+, SMF 80km\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/1/4\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/1/5\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/1/6\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-GDL01-01.txt:NAME: \"module mau 0/1/1/7\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-MRT01-01.txt:NAME: \"module 0/RSP0/CPU0\", DESCR: \"ASR9K Route Switch Processor with 440G/slot Fabric and 12GB\" RMAGRJO-MRT01-01.txt:NAME: \"module 0/RSP1/CPU0\", DESCR: \"ASR9K Route Switch Processor with 440G/slot Fabric and 12GB\" RMAGRJO-MRT01-01.txt:NAME: \"module 0/0/CPU0\", DESCR: \"160G Modular Linecard, Service Edge Optimized\" RMAGRJO-MRT01-01.txt:NAME: \"module 0/0/0\", DESCR: \"ASR 9000 8-port 10GE Modular Port Adapter\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/0/0\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/0/1\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/0/2\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/0/3\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/0/4\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/0/5\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/0/6\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/0/7\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-MRT01-01.txt:NAME: \"module 0/0/1\", DESCR: \"ASR 9000 8-port 10GE Modular Port Adapter\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/1/0\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/1/2\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/1/3\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/1/4\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/1/5\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/1/6\", DESCR: \"10GBASE-ER 1550nm SMF 40KM\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/0/1/7\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" RMAGRJO-MRT01-01.txt:NAME: \"module 0/1/CPU0\", DESCR: \"160G Modular Linecard, Service Edge Optimized\" RMAGRJO-MRT01-01.txt:NAME: \"module 0/1/0\", DESCR: \"ASR 9000 8-port 10GE Modular Port Adapter\" RMAGRJO-MRT01-01.txt:NAME: \"module mau 0/1/0/0\", DESCR: \"10GBASE-LR SFP+ Module for SMF\" "; // result will be an iterator over tuples containing the start and end indices for each match in the string let result = regex.captures_iter(string); for mat in result { println!("{:?}", mat); } }

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/