Regular Expressions 101

Save & Share

  • Regex Version: ver. 24
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

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"
"

Test String

Substitution

Processing...

Code Generator

Generated Code

#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox Local $sRegex = "! Global keywords\n\n(.*?)(?=\n\s*\n)" Local $sString = "" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "! Generated with OLGA version 2017.2.0" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "! Global keywords" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "OPTIONS FLOWMODEL=OLGAHD" & @CRLF & _ "CASE AUTHOR=Schlumberger, PROJECT=OLGA, TITLE="Basic Case"" & @CRLF & _ "FILES PVTFILE=./3phase.tab" & @CRLF & _ "INTEGRATION ENDTIME=60 M, MAXDT=5 s, MINDT=0.01 s, STARTTIME=0 s, DTSTART=0.01 s" & @CRLF & _ "OUTPUT DTOUT=1 h" & @CRLF & _ "PROFILE DTPLOT=5 M" & @CRLF & _ "TREND DTPLOT=15 s" & @CRLF & _ "TRENDDATA VARIABLE=(VOLGBL, HT, GTSOUR)" & @CRLF & _ "" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "! Library keywords" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "WALL LABEL="WALL-1", THICKNESS=(0.009, 0.02, 0.02) m, MATERIAL=("MATER-1", "MATER-2", \" & @CRLF & _ " "MATER-2")" & @CRLF & _ "WALL LABEL="WALL-2", THICKNESS=(0.0075, 0.02, 0.02) m, MATERIAL=("MATER-1", "MATER-2", \" & @CRLF & _ " "MATER-2")" & @CRLF & _ "MATERIAL LABEL="MATER-1", CAPACITY=500 J/kg-C, CONDUCTIVITY=50 W/m-C, DENSITY=7850 kg/m3" & @CRLF & _ "MATERIAL LABEL="MATER-2", CAPACITY=880 J/kg-C, CONDUCTIVITY=1 W/m-C, DENSITY=2500 kg/m3" & @CRLF & _ "" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "! Network Component" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "NETWORKCOMPONENT TYPE=FLOWPATH, TAG=FP_PIPELINE" & @CRLF & _ " PARAMETERS LABEL=PIPELINE" & @CRLF & _ " GEOMETRY LABEL="GEOM-1"" & @CRLF & _ " PIPE ROUGHNESS=5E-05 m, LABEL="PIPE-1", WALL="WALL-1", NSEGMENT=10, LENGTH=400 m, \" & @CRLF & _ " ELEVATION=10 m, DIAMETER=0.12 m" & @CRLF & _ " BRANCH FLUID=Fluid1" & @CRLF & _ " HEATTRANSFER LABEL="HEATTRANS-1", TAMBIENT=6 C, HAMBIENT=6.5 W/M2-C" & @CRLF & _ " SOURCE LABEL="SOURCE-1", TIME=(0, 10, 20, 30, 40) M, PIPE="PIPE-1", SECTION=1, \" & @CRLF & _ " TEMPERATURE=(62, 62, 62, 62, 62) C, MASSFLOW=(18, 18, 9, 9, 18) KG/S" & @CRLF & _ " TRENDDATA PIPE="PIPE-1", SECTION=1, VARIABLE=(HOL, HOLWT, ID, PT, Q2, TM, TU)" & @CRLF & _ " TRENDDATA VARIABLE=(OILC, WATC, GASC, OILCFR, WATCFR, GASCFR)" & @CRLF & _ " PROFILEDATA VARIABLE=(HOL, PT, TM, QLT, QG, Q2, ID, QLTWT)" & @CRLF & _ " SERVERDATA PIPE="PIPE-1", SECTION=1, VARIABLE=(HOL, HOLWT, PT, TM)" & @CRLF & _ " SERVERDATA VARIABLE=(HOL, HOLWT, PT, TM)" & @CRLF & _ " SERVERDATA VARIABLE=(QLT, QG, QLTWT, ID)" & @CRLF & _ " TRENDDATA PIPE="PIPE-1", SECTION=11, VARIABLE=(QT, QG, QLT, QLTHL, QLTWT, QGST, \" & @CRLF & _ " QOST, QWTST, GT, GG, GL)" & @CRLF & _ "ENDNETWORKCOMPONENT" & @CRLF & _ "" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "! Network Component" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "NETWORKCOMPONENT TYPE=NODE, TAG=NODE_INLET" & @CRLF & _ " PARAMETERS LABEL=INLET, TYPE=CLOSED" & @CRLF & _ "ENDNETWORKCOMPONENT" & @CRLF & _ "" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "! Network Component" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "NETWORKCOMPONENT TYPE=NODE, TAG=NODE_OUTLET" & @CRLF & _ " PARAMETERS LABEL=OUTLET, TYPE=PRESSURE, TEMPERATURE=22 C, PRESSURE=5000000 Pa, \" & @CRLF & _ " FLUID=Fluid1" & @CRLF & _ "ENDNETWORKCOMPONENT" & @CRLF & _ "" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "! Connections" & @CRLF & _ "!**************************************************************************************" & @CRLF & _ "CONNECTION TERMINALS = (FP_PIPELINE INLET, NODE_INLET FLOWTERM_1)" & @CRLF & _ "CONNECTION TERMINALS = (FP_PIPELINE OUTLET, NODE_OUTLET FLOWTERM_1)" & @CRLF & _ "" & @CRLF & _ "ENDCASE" & @CRLF & _ "" Local $sSubst = "" Local $sResult = StringRegExpReplace($sString, $sRegex, $sSubst) MsgBox($MB_SYSTEMMODAL, "Result", $sResult)

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 AutoIt, please visit: https://www.autoitscript.com/autoit3/docs/functions/StringRegExp.htm