nicolas cellier wrote:

This behavior is squeakish, other Smalltalk match differently:

VW: '**' match: 'e'. "true" gst: '**' match: 'e'. "true"

Anyway, this pattern matching is limited. How do you match a '*' itself? I thought your example might be interpreted as an escape sequence, but no, there is no escape in this simple matching.

'**' match: '*'. "false" '*' match: '*'. "false"

Try VBregex or another regex package.

Nicolas

Hi, thank you. In addition to the expressions below, I found, that #match: does not behave as stated by the comment given in the method definition itself:

From ByteString>>match:

" [snip] 'foo*baz' match: 'foo23baz' true 'foo*baz' match: 'foobaz' true <---- 'foo*baz' match: 'foo23bazo' false 'foo' match: 'Foo' true 'foo*baz*zort' match: 'foobazort' false 'foo*baz*zort' match: 'foobazzort' false <---- [snip] "

confused, Christoph

Ch Lamprecht a écrit :

...

Hello,

I found the following results for some expressions using #match:

'e' match: 'e'. "true" '*' match: 'e'. "true" '#' match: 'e'. "true"

'*e' match: 'e'. "true" '*#' match: 'e'. "false" '**' match: 'e'. "false"

'*' match: ''. "true" '**' match: ''. "false"

Is this expected behavior? Looks like * is sometimes 'greedy', sometimes not. (Comparing 4 and 5) Thank you for any hints.

Christoph

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Hello,

I browsed String>>startingAt:match:startingAt:

and changed two lines to make errorhandling work as probably intended by the author.

startingAt: keyStart match: text startingAt: textStart "Answer whether text matches the pattern in this string. Matching ignores upper/lower case differences. Where this string contains #, text may contain any character. Where this string contains *, text may contain any sequence of characters." | anyMatch matchStart matchEnd i matchStr j ii jj | i := keyStart. j := textStart.

"Check for any #'s" [i > self size ifTrue: [^ j > text size "Empty key matches only empty string"]. (self at: i) = $#] whileTrue: ["# consumes one char of key and one char of text" j > text size ifTrue: [^ false "no more text"]. i := i+1. j := j+1].

"Then check for *" (self at: i) = $* ifTrue: [i = self size ifTrue: [^ true "Terminal * matches all"]. "* means next match string can occur anywhere" anyMatch := true. matchStart := i + 1] ifFalse: ["Otherwise match string must occur immediately" anyMatch := false. matchStart := i].

"Now determine the match string" matchEnd := self size. (ii := self indexOf: $* startingAt: matchStart) > 0 ifTrue:

"changed the following line to:" [ii = matchStart ifTrue: [self error: '** not valid -- use * instead']. matchEnd := ii-1]. (ii := self indexOf: $# startingAt: matchStart) > 0 ifTrue:

"changed the following line to:" [ii = matchStart ifTrue: [self error: '*# not valid -- use #* instead']. matchEnd := matchEnd min: ii-1]. matchStr := self copyFrom: matchStart to: matchEnd.

"Now look for the match string" [jj := text findString: matchStr startingAt: j caseSensitive: false. anyMatch ifTrue: [jj > 0] ifFalse: [jj = j]] whileTrue: ["Found matchStr at jj. See if the rest matches..." (self startingAt: matchEnd+1 match: text startingAt: jj + matchStr size) ifTrue: [^ true "the rest matches -- success"]. "The rest did not match." anyMatch ifFalse: [^ false]. "Preceded by * -- try for a later match" j := j+1]. ^ false "Failed to find the match string"

Kent Loobey wrote:

On Tuesday 08 January 2008 13:03:22 Ch Lamprecht wrote:

...

nicolas cellier wrote:

...

This behavior is squeakish, other Smalltalk match differently:

VW: '**' match: 'e'. "true" gst: '**' match: 'e'. "true"

Anyway, this pattern matching is limited. How do you match a '*' itself? I thought your example might be interpreted as an escape sequence, but no, there is no escape in this simple matching.

'**' match: '*'. "false" '*' match: '*'. "false"

Try VBregex or another regex package.

Nicolas

Hi, thank you. In addition to the expressions below, I found, that #match: does not behave as stated by the comment given in the method definition itself:

From ByteString>>match:

" [snip] 'foo*baz' match: 'foo23baz' true 'foo*baz' match: 'foobaz' true <---- 'foo*baz' match: 'foo23bazo' false 'foo' match: 'Foo' true 'foo*baz*zort' match: 'foobazort' false 'foo*baz*zort' match: 'foobazzort' false <---- [snip] "

In general * means any character including no characters.

So the first one is foo any-character baz.

The third is false because of the "o" on the end. If you wanted it to work you could put 'foo*baz*'.

I don't know why the last one wasn't reported as true.

...

confused, Christoph

...

Ch Lamprecht a écrit :

...

Hello,

I found the following results for some expressions using #match:

'e' match: 'e'. "true" '*' match: 'e'. "true" '#' match: 'e'. "true"

'*e' match: 'e'. "true" '*#' match: 'e'. "false" '**' match: 'e'. "false"

'*' match: ''. "true" '**' match: ''. "false"

Is this expected behavior? Looks like * is sometimes 'greedy', sometimes not. (Comparing 4 and 5) Thank you for any hints.