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

/
/
gm

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

# If you'd like to omit non-matching lines from the result; add ';d' to the end of the expression. sed -E 's/<span>(.*?)<\\/span><br>/$1\n/gm;t' <<< "<span>DH&amp;A Team</span><br><span>Domain Users</span><br><span>DPE EDP Engineering All</span><br><span>G_Arrayras_Associate</span><br><span>G_Azure_App_GoGuide</span><br><span>g_azure_dha_dhap_devs_devtest</span><br><span>g_azure_dha_dhap_devs_npe</span><br><span>g_azure_dha_dhap_devs_prd</span><br><span>g_azure_dha_edp_devs_npe</span><br><span>g_azure_dha_edp_devs_prod</span><br><span>g_Azure_GitHub_Enterprise_Managed_User</span><br><span>g_Azure_Innersource_Members</span><br><span>G_Azure_Intune_PersonallyOwned</span><br><span>G_Azure_Jfrog_Artifactory</span><br><span>G_Azure_M365Apps_ZoomAddIn_Enabled</span><br><span>g_Azure_VSTS_DHA_PI_Eng_TEMP_OnS_Dev_Members</span><br><span>g_Azure_VSTS_DHA_PInE_EDP_Chassis_OnShore_TechAdmins</span><br><span>g_Azure_VSTS_DHA_PInE_EDP_DP_APaaS_OnShore_TechAdmins</span><br><span>g_Azure_VSTS_DHA_PInE_EDP_DP_ECOM_OnShore_TechAdmins</span><br><span>g_Azure_VSTS_DHA_PInE_EDP_DP_LHR_OnShore_TechAdmins</span><br><span>g_Azure_VSTS_DHA_PInE_EDP_DPFit_OnShore_TechAdmins</span><br><span>g_Azure_VSTS_DHA_PInE_EDP_Infra_OnShore_TechAdmins</span><br><span>g_Azure_VSTS_DHA_PInE_EDP_Interop_OnShore_TechAdmins</span><br><span>g_Azure_VSTS_DHA_PInE_EDP_PIE_OnShore_Members</span><br><span>g_Azure_VSTS_DHA_PInE_EDP_PIE_OnShore_TechAdmins</span><br><span>g_Azure_VSTS_DHA_PInE_EDP_Sec_OnShore_TechAdmins</span><br><span>G_Azure_VSTS_LicensedVia_Stakeholder</span><br><span>G_Azure_Zoom_Enabled</span><br><span>G_Azure_ZPA</span><br><span>G_Citrix_30Day_Outlook_Cache</span><br><span>G_HOME_LOUISILON02S_USERDAT01</span><br><span>G_humemp</span><br><span>G_O365_PST_Control</span><br><span>G_OracleDept_70360</span><br><span>G_TS_CHROME_BROWSER</span><br><span>G_TS_EDGE_BROWSER</span><br><span>G_TS_Humana_Intranet_Applications</span><br><span>G_TS_Psynch</span><br><span>G_TS_Web_Mail</span><br><span>G_VAS_AWS-TranscendDevQA</span><br><span>ServiceNow PPM Time Users</span><br><span>Targeted Associate List</span><br></div>"

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 SED, please visit: https://www.gnu.org/software/sed/manual/html_node/The-_0022s_0022-Command.html