Regular Expression to Match String Exactly?

by

use ^ and $ to match the start and end of your string

^[0-9]{6}$
^[0-9]{6}\.[0-9]{3}$

Reference: http://www.regular-expressions.info/anchors.html

Also, as noted by Mikael Svenson, you can use the word boundary \b if you are searching for this pattern in a larger chunk of text.

Reference: http://www.regular-expressions.info/wordboundaries.html

You could also write both those regexes in one shot

^\d{6}(\.\d{3})?$

More Related Contents:

  1. What do the characters ((?:(?:(?: mean in pattern-matching? [duplicate]
  2. Java: splitting a comma-separated string but ignoring commas in quotes
  3. Split string with dot as delimiter
  4. Use String.split() with multiple delimiters
  5. Java how to replace 2 or more spaces with single space in string and delete leading and trailing spaces
  6. Java Regex Capturing Groups
  7. SCJP6 regex issue
  8. Get the index of a pattern in a string using regex
  9. Regular expression for excluding special characters [closed]
  10. How to determine if a number is a prime with regex?
  11. Java regex to extract text between tags
  12. Java regex: Repeating capturing groups
  13. Why does this Java regex cause “illegal escape character” errors?
  14. java.util.regex – importance of Pattern.compile()?
  15. Any character including newline – Java Regex
  16. How do I create a Stream of regex matches?
  17. Regex to match words of a certain length
  18. Java regular expression OR operator
  19. regex to match substring after nth occurence of pipe character
  20. What is the difference between `Greedy` and `Reluctant` regular expression quantifiers?
  21. Understanding regex in Java: split(“\t”) vs split(“\\t”) – when do they both work, and when should they be used
  22. How to replace ” \ ” with ” \\ ” in java
  23. Validate a file name on Windows
  24. Java Regex pattern that matches in any online tester but doesn’t in Eclipse
  25. Java Pattern Matcher: create new or reset?
  26. How can split a string which contains only delimiter?
  27. Regular expression to get an attribute from HTML tag
  28. Issue with Java Regex \b
  29. Java’s Scanner vs String.split() vs StringTokenizer; which should I use?
  30. java regex pattern unclosed character class

Leave a Comment