Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
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
Processing...

Test String

Substitution
Processing...

Code Generator

Language

Generated Code

import re regex = re.compile(r"^(?=\S.+\nCoverage\sLevel)|^(?=\S.+\nNon-Covered\s)", flags=re.MULTILINE) test_str = ("Out of Pocket (Stop Loss)\n" "Coverage Level: Individual\n" "Service Type: Health Benefit Plan Coverage\n" "Insurance Type Code: HM Health Maintenance Organization (HMO)\n" "Time Period Qualifier: Calendar Year\n" "Amount: $8,500.00\n" "In Plan Network Indicator: Unknown\n" "Deductible\n" "Coverage Level: Individual\n" "Service Type: Vision (Optometry)\n" "https://luna.ema.md/ema/patient/InsuranceOverviewForm.action?pic1.0u85-w2bBh0R86_K9v71KolpMN1sZmZ0Lxolu1TW4qD3al-JJFDVNX81... 13/172/21/22, 10:26 AM Luna Dermatology: Patient Insurance\n" "Insurance Type Code: HM Health Maintenance Organization (HMO)\n" "Plan Coverage Description: Fidelis Care Silver\n" "Amount: $0.00\n" "Authorization/Certification Req'd: No\n" "In Plan Network Indicator: no\n" "Co-Payment\n" "Coverage Level: Individual\n" "Service Type: Vision (Optometry)\n" "Insurance Type Code: HM Health Maintenance Organization (HMO)\n" "Plan Coverage Description: Fidelis Care Silver\n" "Amount: $0.00\n" "Authorization/Certification Req'd: No\n" "In Plan Network Indicator: Yes\n" "Co-Insurance\n" "Coverage Level: Individual\n" "Service Type: Vision (Optometry)\n" "Insurance Type Code: HM Health Maintenance Organization (HMO)\n" "Plan Coverage Description: Fidelis Care Silver\n" "Authorization/Certification Req'd: No\n" "In Plan Network Indicator: Unknown\n\n" "Out of Pocket (Stop Loss)\n" "Coverage Level: Family\n" "Service Type: Health Benefit Plan Coverage\n" "Insurance Type Code: HM Health Maintenance Organization (HMO)\n" "Time Period Qualifier: Remaining\n" "Amount: $16,190.82\n" "In Plan Network Indicator: Unknown\n" "Non-Covered\n" "Coverage Level: Individual\n" "Service Type: Medical Care\n" "Insurance Type Code: HM Health Maintenance Organization (HMO)\n" "Plan Coverage Description: Fidelis Care Silver\n" "In Plan Network Indicator: No\n" "Message: Medical Care\n" "Non-Covered\n" "Coverage Level: Individual\n" "Service Type: Durable Medical Equipment Purchase\n" "Insurance Type Code: HM Health Maintenance Organization (HMO)\n" "Plan Coverage Description: Fidelis Care Silver\n" "In Plan Network Indicator: No\n" "Message: DME Purchase") subst = "\\n" result = regex.sub(subst, test_str) if result: print(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 Python, please visit: https://docs.python.org/3/library/re.html