Regular Expressions 101

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/
^text\t([\d.\h]+)$
/
gmu
^ asserts position at start of a line
text matches the characters text literally (case sensitive)
\t matches a tab character (ASCII 9)
1st Capturing Group
([\d.\h]+)
Match a single character present in the list below
[\d.\h]+
+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
\d matches a digit zero through nine in any script except ideographic scripts (equal to \p{Nd})
. matches the character . literally (case sensitive)
\h matches any horizontal whitespace character (equal to [[:blank:]])
$ asserts position at the end of a line
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
u modifier: unicode. Pattern strings are treated as UTF-16. Also causes escape sequences to match unicode characters
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gmu

Test String

Substitution

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Regular Expressions 101

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