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

Code Generator

Language

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "^(?P<unit_type>SL|SV)(?P<unit_size>10|15|20|25|30)(?P<mounting_type>P|G)(?P<decompression_feature>A|B)(?P<cracking_pressure>1|2|3|4)(?P<sep_1>-)(?P<unit_series>4X)(?P<sep_2>/|=)(?P<pilot_valve>6U|)(?P<type_of_limit_switch>QM|)(?P<power_supply_of_limit_switch>G24|)(?P<sep_3>/|)(?P<seal_material>M|V|)(?P<sep_4>/|)(?P<surface_coating>J3|)(?P<pipe_port>/12|)(?P<additional_details>(.|[0-9])*)$"; final String string = "SV20PB1-4X/V\n" + "SV10GA3-4X/V\n" + "SL20GB1-4X/M/12\n" + "SV30PB2-4X/V\n" + "SV20GA2-4X/V\n" + "SL30PB2-4X/V\n" + "SV20GB3-4X/M/12\n" + "SL20PB4-4X/V\n" + "SL10GA1-4X/V/12\n" + "SV20GB4-4X/V\n" + "SV20GA1-4X=M\n" + "SV20GB1-4X/M/12\n" + "SL20GA3-4X/V\n" + "SV20GA3-4X/M/12\n" + "SL30PB4-4X/V\n" + "SL20PA1-4X/MSO286\n" + "SV10GA2-4X/M/12\n" + "SL20GA1-4X/V/12\n" + "SL10PB1-4X/MSO286\n" + "SV30GB2-4X/V\n" + "SV30GA1-4X/V/12\n" + "SL30GA1-4X/V/12=\n" + "SV30PB4-4X/V\n" + "SL25GB3-4X/\n" + "SV10GA3-4X/M\n" + "SV10GB3-4X/M\n" + "SV10PA2-4X/V\n" + "SL10PA4-4X/V\n" + "SV10PB2-4X/M\n" + "SL10PB1-4X/V\n" + "SL10PA4-4X/M\n" + "SV10PB1-4X/V\n" + "SV10GB1-4X/M/12\n" + "SL10PB3-4X/M\n" + "SV10GB1-4X/V\n" + "SL10PA2-4X/M\n" + "SL10PA3-4X/M\n" + "SL10PB1-4X/M\n" + "SL10GA4-4X/M\n" + "SL10GB3-4X/M\n" + "SL10GA1-4X/M/12\n" + "SL10GA1-4X/V\n" + "SL10GA2-4X/M\n" + "SV10PA2-4X/M\n" + "SL10GB1-4X/M\n" + "SL10PB4-4X/M\n" + "SV10GB1-4X/M\n" + "SL10GA3-4X/M\n" + "SV10GA2-4X/M\n" + "SV10GB4-4X/M\n" + "SL10PB2-4X/M\n" + "SL10PA1-4X/V\n" + "SV10PA3-4X/M\n" + "SV10GA1-4X/V/12\n" + "SV10PA1-4X/V\n" + "SV10PB3-4X/M\n" + "SV10GB2-4X/M\n" + "SV10GA1-4X/V\n" + "SV10PA3-4X/V\n" + "SV10PB1-4X/M\n" + "SL10GB2-4X/V\n" + "SL10GB2-4X/M\n" + "SV10GA2-4X/V/12\n" + "SV10GA1-4X/M/12\n" + "SV10GA2-4X/V\n" + "SV10GA1-4X/M\n" + "SV10PA1-4X/M\n" + "SL10GA1-4X/M\n" + "SL10PA1-4X/M\n" + "SL30GA3-4X/M\n" + "SV30GA3-4X/M\n" + "SL20GB2-4X/M\n" + "SV20PA1-4X/V\n" + "SL30PA1-4X/V\n" + "SL20PB2-4X/M\n" + "SV20GA2-4X/M\n" + "SV20GA1-4X/V\n" + "SV10PB4-4X/V\n" + "SL20GB1-4X/M\n" + "SV25GB3-4X/\n" + "SL20PB3-4X/M\n" + "SL25GB2-4X/\n" + "SL30GB1-4X/M\n" + "SL30GA2-4X/M\n" + "SL20PA4-4X/M\n" + "SV20GB4-4X/M\n" + "SL20PA2-4X/V\n" + "SV30PA1-4X/V\n" + "SV25GA2-4X/\n" + "SV30GA2-4X/M\n" + "SL20PA3-4X/V\n" + "SV20PB3-4X/M\n" + "SL20PA1-4X/V\n" + "SL30PA4-4X/M\n" + "SV20PB1-4X/M\n" + "SV20PB2-4X/M\n" + "SL30PA4-4X/V\n" + "SV30PA2-4X/V\n" + "SV20PA3-4X/V\n" + "SL30GB2-4X/M\n" + "SV30PB1-4X/M\n" + "SL30GA1-4X/M/12\n" + "SL10GA2-4X/V\n" + "SV20GB3-4X/M\n" + "SL25GB1-4X/V\n" + "SL30GB2-4X/V/12\n" + "SL25GA3-4X/\n" + "SL30PB2-4X/M\n" + "SV30GB2-4X/M\n" + "SL20GA1-4X/V\n" + "SL20PB2-4X/V\n" + "SL10PA3-4X/V\n" + "SV30PA4-4X/M\n" + "SV10PB4-4X/M\n" + "SL30PB3-4X/M\n" + "SL25GA1-4X/V\n" + "SL20GB3-4X/M\n" + "SV25GA2-4X/V\n" + "SV20PA1-4X/MSO67\n" + "SL10GB1-4X/M/12\n" + "SL30PA1-4X/MSO67\n" + "SL20GA4-4X/M\n" + "SV25GB1-4X/V\n" + "SV20PB4-4X/M\n" + "SV25GA1-4X/V\n" + "SL20GA2-4X/V\n" + "SL30PB1-4X/V\n" + "SV20GA1-4X/M/12\n" + "SL25GA4-4X/\n" + "SL20GA1-4X/M/12\n" + "SV10GA2-4X/MSO43\n" + "SV10GB2-4X/V\n" + "SL20PB1-4X/V\n" + "SL20GB1-4X/V\n" + "SV10GB4-4X/V\n" + "SV10GA4-4X/V\n" + "SL30GA4-4X/M\n" + "SV20GA4-4X/M\n" + "SV20GA4-4X/V\n" + "SV10GA4-4X/MSO287\n" + "SV30PB4-4X/M\n" + "SL30PB4-4X/M\n" + "SL20PB4-4X/M\n" + "SV10GA3-4X/M/12\n" + "SL30PA2-4X/V\n" + "SV25GA4-4X/\n" + "SL10PB2-4X/V\n" + "SL20PA4-4X/V\n" + "SV30GB4-4X/M\n" + "SV30PB3-4X/M\n" + "SV25GB1-4X/\n" + "SV30GA1-4X/M/12\n" + "SV20PB2-4X/V\n" + "SL10PA1-4X/MSO286\n" + "SV20GA2-4X/M/12\n" + "SV20GA1-4X/V/12\n" + "SL30PA3-4X/V\n" + "SV30GA2-4X/V\n" + "SL10GA2-4X/M/12\n" + "SL10GB3-4X/V\n" + "SV25GB2-4X/\n" + "SL20GA1-4X/MSO180\n" + "SL30GB3-4X/M\n" + "SV25GA3-4X/\n" + "SL20GB4-4X/M\n" + "SV30PA4-4X/V\n" + "SL10PB4-4X/V\n" + "SV30GA1-4X/V\n" + "SL30GA2-4X/V\n" + "SV20GB1-4X/V\n" + "SV30GA2-4X/M/12\n" + "SL20PA2-4X/MSO67\n" + "SV20PA4-4X/M\n" + "SL20PB3-4X/V\n" + "SL10GB4-4X/M\n" + "SL30GB4-4X/M\n" + "SL20GB2-4X/V\n" + "SL30GB2-4X/V\n" + "SL25GB2-4X/V\n" + "SL25GA2-4X/V\n" + "SL10GB4-4X/V/12\n" + "SL20GB3-4X/V\n" + "SV30GB1-4X/M/12\n" + "SL20GB1-4X/MSO180\n" + "SV10PA1-4X/MT\n" + "SL30PB3-4X/V\n" + "SV20PA2-4X/V\n" + "SV10GB3-4X/M/12\n" + "SV30GB3-4X/M\n" + "SV30PB3-4X/V\n" + "SV30GA4-4X/M\n" + "SL10GB1-4X/V\n" + "SV10PB2-4X/V\n" + "SV10PA4-4X/M\n" + "SL10GB1-4X/V/12\n" + "SL10PA2-4X/V\n" + "SV20GA1-4X/M\n" + "SV25GA1-4X/\n" + "SV30GA1-4X/M\n" + "SL20GA1-4X/M\n" + "SL25GA1-4X/\n" + "SL30GA1-4X/M\n" + "SV20PA1-4X/M\n" + "SV30PA1-4X/M\n" + "SL20PA1-4X/M\n" + "SL30PA1-4X/M\n" + "SL10GA3-4X/V\n" + "SV10GA4-4X/M\n" + "SV20PA3-4X/M\n" + "SV20GB1-4X/M\n" + "SL30GA3-4X/V\n" + "SV30PA2-4X/M\n" + "SL30PA2-4X/M\n" + "SV20GB2-4X/M\n" + "SV20PA2-4X/M\n" + "SL20PA2-4X/M\n" + "SL30PA3-4X/M\n" + "SL20PB1-4X/M\n" + "SL20PA3-4X/M\n" + "SV20GA3-4X/M\n" + "SV30PB2-4X/M\n" + "SV30GB1-4X/M\n" + "SL20GA3-4X/M\n" + "SL30GA1-4X/V\n" + "SV30PA3-4X/M\n" + "SL25GB1-4X/\n" + "SL20GA2-4X/M\n" + "SL25GA2-4X/\n" + "SL30PB1-4X/M\n" + "SL20GA2-4X/M/12\n" + "SL30GA4-4X/M/12\n" + "SL10GA4-4X/V\n" + "SL30GA2-4X/M/12\n" + "SL30PA1-4X/MSO286\n" + "SL30GA2-4X/V/12\n" + "SV20PA4-4X/V\n" + "SL30GB1-4X/V\n" + "SL30PA1-4X/MT\n" + "SV20GB1-4X/V/12\n" + "SL20GA4-4X/V\n" + "SL20GA1-4X/6U/M\n" + "SL20GA1-4X/6U/V\n" + "SV10PB3-4X/V\n" + "SV10PA4-4X/V\n" + "SL10PB3-4X/V\n" + "SV30PB1-4X/V\n" + "SV30PA3-4X/V\n" + "SL20PA2-4X/MT\n" + "SV10PA2-4X/M/J3\n" + "SV20PA2-4X/M/J3\n" + "SL30GA4-4X/V\n" + "SV25GB3-4X/V\n" + "SL30GA3-4X/6U/M\n" + "SL20GA3-4X/M/12\n" + "SL10PA1-4X/MT\n" + "SV10PA1-4X=M\n" + "SL30GA1-4X/6U/V\n" + "SL30PB3-4X/6UQMG24M-A08B10P12X99Y00\n" + "SV30GB1-4X/V\n" + "SL20PA1-4X/6U/M-A08B99T00P00X99Y00\n" + "SL20PA2-4X/6U/M-A08B99X99Y00\n" + "SL20PB3-4X/QMG24M\n" + "SL20PB3-4X/QMG24V\n" + "SL20PB3-4X/6UQMG24M-A08B99P00X99Y00\n" + "SL30PB3-4X/6UQMG24M-A08B99P00X99Y00\n" + "SL20GA3-4X/6U/M\n" + "SL30PB3-4X/6UQMG24M-A08B00P12X99Y00\n" + "SL20GA2-4X/6U/M\n" + "SL20GB2-4X/6U/M\n" + "SL20PB3-4X/6UQMG24M-A08B12P00X99Y00\n" + "SL30PA1-4X/6U/M-A08B99X99Y00\n" + "SL30PB3-4X/6UQMG24M-A08B30P00X99Y00\n" + "SL30PB3-4X/6UQMG24M-A08B12P00X99Y00\n" + "SV20GB2-4X/V\n" + "SL30GA1-4X/6U/M\n" + "SL30PA1-4X/6U/M-X00Y00-168\n" + "SV10GB1-4X=M\n" + "SL30PA2-4X/6U/M-X00Y00-168\n" + "SL30PA1-4X=V\n" + "SL30PB3-4X/6UQMG24M-A00B08P12X99Y00\n" + "SL30PA3-4X/6U/M-A08B99X99Y00\n" + "SL20PB1-4X/6U/M-A08B99X99Y00\n" + "SL30PB1-4X/6U/M-A08B99X99Y00\n" + "SL10GA2-4X=M\n" + "SL20PB3-4X/6UQMG24M-A00B00P00X00Y00\n" + "SL20PA2-4X/6U/M-A08B10X99Y00\n" + "SL30GA2-4X/6U/M\n" + "SL20PB3-4X/6UQMG24M-A08B00P12X99Y00\n" + "SL20PB3-4X/6UQMG24M-A00B08P12X99Y00\n" + "SL20PB1-4X/MSO286\n" + "SL20GB3-4X/QMG24M\n" + "SL30PB3-4X/QMG24M\n" + "SL10PB3-4X/QMG24M\n" + "SL10GB3-4X/QMG24M\n" + "SL30GB3-4X/QMG24M\n" + "SV10PB3-4X/QMG24M\n" + "SL25GB3-4X/QMG24\n" + "SV20PB3-4X/QMG24M\n" + "SV10GB3-4X/QMG24M\n" + "SL10PB3-4X/QMG24V\n" + "SV30PB3-4X/QMG24M\n" + "SL30GB3-4X/QMG24V\n" + "SL30PB3-4X/QMG24V\n" + "SL20GB3-4X/QMG24V\n" + "SL10PA3-4X/VJ3\n" + "SL10PA4-4X/VJ3\n" + "SV10GA1-4X/M/J3\n" + "SL30PA1-4X/6U/M-A08B10X99Y00/J3\n" + "SL10PA1-4X/M/J3\n" + "SL10PB3-4X/VJ3\n" + "SV20PA1-4X/M/J3\n" + "SL20PB1-4X/M/J3\n" + "SL20PA1-4X/M/J3\n" + "SL20PA4-4X/M/J3\n" + "SL20PA2-4X/M/J3\n" + "SL30PA3-4X/6U/M-X00Y00-168\n" + "SL20GB3-4X/6UQMG24V\n" + "SL20GB3-4X/6UQMG24M\n" + "SL30GB3-4X/6UQMG24V\n" + "SL30PA1-4X/M/J3\n" + "SL30PA2-4X/M/J3\n" + "SV10PA1-4X/M/J3\n" + "SV10PA3-4X/M/J3\n" + "SV20PB4-4X/V\n" + "SV25GB4-4X/\n" + "SV30GB3-4X/QMG24M\n" + "SV20PA1-4X/VSO286\n" + "SL30GB4-4X/V\n" + "SV30GB3-4X/QMG24/V\n" + "SV10GA1-4X=M\n" + "SV20GB2-4X/V/12\n" + "SV20PA3-4X/M/J3\n" + "SL10PA1-4X/VJ3\n" + "SL30PB3-4X/6UQMG24M-A08B08P12X99Y00\n" + "SL10GA1-4X/M/J3\n" + "SL30GB3-4X/6U/V\n" + "SL20GB3-4X/6U/V\n" + "SL25GB3-4X/QMG24V\n" + "SL10GB3-4X/QMG24V\n" + "SV20GB3-4X/QMG24M\n" + "SV30PB2-4X/MSO286\n" + "SL20PB2-4X/M/J3\n" + "SL30GB3-4X/M/J3\n" + "SV10GB3-4X/QMG24V\n" + "SV20GA1-4X/M/J3\n" + "SL30GB2-4X/M/J3\n" + "SL20PA1-4X=M\n" + "SL20PB4-4X/6U/M-A08B99X99Y00\n" + "SV10PB3-4X/QMG24V\n" + "SL30PB3-4X/6UQMG24M-A08B20P20X99Y00\n" + "SL20PB3-4X/6UQMG24M-A08B20P20X99Y00\n" + "SL20PB3-4X/6UQMG24M-A08B08P00X99Y00\n" + "SL20PB2-4X=M\n" + "SV20PA1-4X=M\n" + "SL20PA1-4X/VJ3\n" + "SL20GA2-4X/V/12\n" + "SL10GA2-4X/V/12\n" + "SV10GB1-4X/V/12\n" + "SL30GB3-4X/M/12\n" + "SL30GB1-4X/M/12\n" + "SV20GB1-4X/V/12\n" + "SL15GB2-4X/12\n" + "SL15GB1-4X/12\n" + "SL15GA1-4X/V/12\n" + "SV20GB2-4X/M/12\n" + "SV30GB2-4X/M/12\n" + "SL15GB4-4X/V/12\n" + "SV30GB2-4X/V/12\n" + "SL30GB3-4X/V/12\n" + "SL20GB3-4X/12\n" + "SL20GA2-4X/12\n"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

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 Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html